/*
* This Code subject the Mozilla Public
* . 2 . 0 . If a of MPL was not distributed with
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef vm_Opcodes_h
#define vm_Opcodes_h
#include <stddef.h>
#include <stdint.h>
#include "js/TypeDecls* file
// clang-format off
/*
* [ SMDOC ] Bytecode Definitions
i java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 19
* SpiderMonkey bytecode instructions .
*
* To use this java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
*
* # define MACRO ( op , op_snake , token , length , nuses , ndefs , format ) *
*
* Then ` FOR_EACH_OPCODE ( MACRO ) ` invokes ` MACRO ` for every opcode .
*
* Field Description
* - - - - - - - - - - - - - - - -
opcode id
* op_snake snake_case form of opcode id
* * nuses Number of stack slots consumed by bytecode , - 1 if variadic
* length Number of bytes including any immediate operands
* nuses Number of stack slots * format JOF_ flags describing instruct ion operand layout , etc .
* ndefs Number of stack slots produced by bytecode
* format JOF_ flags describing instruction operand layout , etc .
*
* * Creating scripts that not the rules can lead to undefined
* BytecodeUtil . h .
*
*
* [ SMDOC ] Bytecode Invariants
*
* Creating scripts that do not follow the rules can lead to undefined
* behavior . Bytecode has many consumers , not just * can t be reached execution such
* analyses , the debugger . That ' s why the rules below apply even to code that
* can ' t be reached in ordinary execution ( such as code after an infinite loop
* or inside an ` if ( false ) ` followed a number operand java.lang.StringIndexOutOfBoundsException: Range [61, 48) out of bounds for length 61
* * offsets , the distance in bytes from the start of the current instruction to
* The ` code ( ) ` of a script must be a packed ( not aligned ) sequence of valid
* instructions from start to end . Each instruction has a single byte opcode
* followed by a number of operand bytes based on the opcode .
*
* # # Jump instructions
*
* Operands named ` offset ` , ` forwardOffset ` , or ` * in the sense https
* offsets , the distance in bytes from the start of the current instruction to
* the start of another * holds, or some cleanup behavior - hat there ' for - iterator java.lang.StringIndexOutOfBoundsException: Range [79, 80) out of bounds for length 79
* ` forwardOffset ` or ` defaultOffset ` must be paths the span establish invariant . In
*
* Forward jumps must jump to a ` JSOp : : JumpTarget ` instruction . Backward jumps ,
java.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 78
* Jump offsets can ' t be zero .
*
* Needless to say , scripts must not contain overlapping instruction sequences
* ( in the sense of < https : //en.wikipedia.org/wiki/Overlapping_gene>).
*
* A script ' s ` trynotes ` and ` scopeNotes ` * it Instructions not jump to this ` JSOp : : JumpTarget ` . ( The VM puts
* note and each scope note marks a region of the bytecode where some invariant
some behavior is - java.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 79
* a particular stack slot , for instance , which must be closed on error . All
* paths into the span must establish that invariant . In practice , this means
* other never into the pan : the way is to the
* bytecode instruction that sets up the invariant ( in our example ,
* ` JSOp : : Iter ` ) .
*
* If a script ' s ` trynotes ` ( see " Try Notes " *
* ` JSTRY_CATCH ` or ` JSTRY_FINALLY ` span , there must be a ` JSOp : : Try `
* instruction script > ` java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
* after it . Instructions must not jump to this ` JSOp : : instructions. `argc` must be small enough that the instruction =
* us there on exception . ) Furthermore , the instruction sequence immediately
* following a ` JSTRY_CATCH ` span must read ` JumpTarget ; Exception ` or , in
* non - function scripts , ` JumpTarget ; Undefined ; SetRval ; Exception ` . ( These
* instructions run with an exception pending ; other instructions aren ' t
* designed to handle that . )
*
* Unreachable instructions are allowed , but they have to follow all the rules .
*
* Control must not reach the end of a script . ( Currently , the last instruction
* is always JSOp : : RetRval . )
*
* # # Other operands
*
* Operands named ` nameIndex ` or ` atomIndex ` ( which appear on instructions that
* have ` JOF_ATOM ` in the ` format ` field ) must be valid indexes into
* ` script - > atoms ( ) ` .
*
* Operands named ` argc ` ( ` JOF_ARGC ` ) are argument counts for call
* instructions . ` argc ` must be small enough that the instruction ' s nuses is < =
* the current stack depth ( see " Stack depth " below ) .
*
* Operands named ` argno ` ( ` JOF_QARG ` ) refer to an argument of the current
* function . ` argno ` must be in the range ` 0 . . script - > function ( ) - > * the stack frame. `localno` must be in the range `0..script->nfixed ( ) ` .
* Instructions with these operands must appear only in function scripts .
*
* Operands named ` localno ` ( ` JOF_LOCAL ` ) refer to a local variable stored in
* the stack frame . ` localno ` must be in the range ` 0 . . script - > nfixed ( ) ` .
*
* Operands named ` resumeIndex ` ( ` JOF_RESUMEINDEX ` ) refer to a resume point in
* the current script . ` resumeIndex ` must be a valid index into
* ` script - > resumeOffsets ( ) ` .
*
* Operands named ` hops ` and ` slot ` ( ` JOF_ENVCOORD ` ) refer a slot in an
* ` EnvironmentObject ` . At run time , they must point to a fixed slot in an
* object on the current environment chain . See ` EnvironmentCoordinates ` .
*
* Operands with the following names must be valid indexes into
* ` script - > gcthings ( ) ` , and the pointer in the vector must point to the right
* type of thing :
*
* - ` objectIndex ` ( ` JOF_OBJECT ` ) : ` PlainObject * ` or ` ArrayObject * `
* - ` baseobjIndex ` ( ` JOF_OBJECT ` ) : ` PlainObject * `
* - ` funcIndex ` ( ` JOF_OBJECT ` ) : ` JSFunction * `
* - ` regexpIndex ` ( ` JOF_REGEXP ` ) : ` RegExpObject * `
* - ` shapeIndex ` ( ` JOF_SHAPE ` ) : ` Shape * `
* - ` scopeIndex ` ( ` JOF_SCOPE ` ) : ` Scope * `
* - ` lexicalScopeIndex ` ( ` JOF_SCOPE ` ) : ` LexicalScope * `
* - ` classBodyScopeIndex ` ( ` JOF_SCOPE ` ) : ` ClassBodyScope * `
* - ` withScopeIndex ` ( ` JOF_SCOPE ` ) : ` WithScope * `
* - ` bigIntIndex ` ( ` JOF_BIGINT ` ) : ` BigInt * `
*
* Operands named ` icIndex ` ( ` JOF_ICINDEX ` ) must be exactly the number of
* preceding instructions in the script that have the JOF_IC flag .
* ( Rationale : Each JOF_IC instruction has a unique entry in
* ` script - > jitScript ( ) - > icEntries ( ) ` . At run time , in the bytecode
* interpreter , we have to find that entry . We could store the IC index as an
* operand to each JOF_IC instruction , but it ' s more memory - efficient to use a
* counter and reset the counter to ` icIndex ` after each jump . )
*
* # # Stack depth
*
* Each instruction has a compile - time stack depth , the number of values on the
* interpreter stack just before executing the instruction . It isn ' t explicitly
* present in the bytecode itself , but ( for reachable instructions , anyway )
* it ' s a function of the bytecode .
*
* - The first instruction has stack depth 0 .
*
* - Each successor of an instruction X has a stack depth equal to
*
* X ' s stack depth - ` js : : StackUses ( X ) ` + ` js : : StackDefs ( X ) `
*
* except for ` JSOp : : Case ` ( below ) .
*
* X ' s " successors " are : the next instruction in the script , if
* ` js : : FlowsIntoNext ( op ) ` is true for X ' s opcode ; one or more
* ` JSOp : : JumpTarget ` s elsewhere , if X is a forward jump or
* ` JSOp : : TableSwitch ` ; and / or a ` JSOp : : LoopHead ` if it ' s a backward jump .
*
* - ` JSOp : : Case ` is a special case because its stack behavior is eccentric .
* The formula above is correct for the next instruction . The jump target
* has a stack depth that is 1 less .
*
* - The ` JSOp : : JumpTarget ` instruction immediately following a ` JSTRY_CATCH `
* or ` JSTRY_FINALLY ` span has the same stack depth as the ` JSOp : : Try `
* instruction that precedes the span .
*
* Every instruction covered by the ` JSTRY_CATCH ` or ` JSTRY_FINALLY ` span
* must have a stack depth > = that value , so that error recovery is
* guaranteed to find enough values on the stack to resume there .
*
* - ` script - > nslots ( ) - script - > nfixed ( ) ` must be > = the maximum stack
* depth of any instruction in ` script ` . ( The stack frame must be big
* enough to run the code . )
*
* ` BytecodeParser : : parse ( ) ` computes stack depths for every reachable
* instruction in a script .
*
* # # Scopes and environments
*
* As with stack depth , each instruction has a static scope , which is a
* compile - time characterization of the eventual run - time environment chain
* when that instruction executes . Just as every instruction has a stack budget
* ( nuses / ndefs ) , every instruction either pushes a scope , pops a scope , or
* neither . The same successor relation applies as above .
*
* Every scope used in a script is stored in the ` JSScript : : gcthings ( ) ` vector .
* They can be accessed using ` getScope ( index ) ` if you know what ` index ` to
* pass .
*
* The scope of every instruction ( that ' s reachable via the successor relation )
* is given in two independent ways : by the bytecode itself and by the scope
* notes . The two sources must agree .
*
* # # Further rules
*
* All reachable instructions must be reachable without taking any backward
* edges .
*
* Instructions with the ` JOF_CHECKSLOPPY ` flag must not be used in strict mode
* code . ` JOF_CHECKSTRICT ` instructions must not be used in nonstrict code .
*
* Many instructions have their own additional rules . These are documented on
* the various opcodes below ( look for the word " must " ) .
*/
// clang-format on
// clang-format off
/*
* SpiderMonkey bytecode categorization ( as used in generated documentation ) :
*
* [ Index ]
* [ Constants ]
* [ Expressions ]
* Unary operators
* Binary operators
* Conversions
* Other expressions
* [ Objects ]
* Creating objects
* Defining properties
* Accessing properties
* Super
* Enumeration
* Iteration
* SetPrototype
* Array literals
* RegExp literals
* Built - in objects
* [ Functions ]
* Creating functions
* Creating constructors
* Calls
* Generators and async functions
* [ Control flow ]
* Jump targets
* Jumps
* Return
* Exceptions
* [ Variables and scopes ]
* Initialization
* Looking up bindings
* Getting binding values
* Setting binding values
* Entering and leaving environments
* Creating and deleting bindings
* Function environment setup
* [ Stack operations ]
* [ Other ]
*/
// clang-format on
// clang-format off
#define FOR_EACH_OPCODE(MACRO) \
/*
* Push ` undefined ` .
*
* Category : Constants
* Operands :
* Stack : = > undefined
*/ \
MACRO(Undefined, undefined,
"" ,
1 ,
0 ,
1 , JOF_BYTE) \
/*
* Push ` null ` .
*
* Category : Constants
* Operands :
* Stack : = > null
*/ \
MACRO(Null, null,
"null" ,
1 ,
0 ,
1 , JOF_BYTE) \
/*
* Push a boolean constant .
*
* Category : Constants
* Operands :
* Stack : = > true / false
*/ \
MACRO(
False , false_,
"false" ,
1 ,
0 ,
1 , JOF_BYTE) \
MACRO(True, true_,
"true" ,
1 ,
0 ,
1 , JOF_BYTE) \
/*
* Push the ` int32_t ` immediate operand as an ` Int32Value ` .
*
* ` JSOp : : Zero ` , ` JSOp : : One ` , ` JSOp : : Int8 ` , ` JSOp : : Uint16 ` , and ` JSOp : : Uint24 `
* are all compact encodings for ` JSOp : : Int32 ` .
*
* Category : Constants
* Operands : int32_t val
* Stack : = > val
*/ \
MACRO(Int32, int32, NULL,
5 ,
0 ,
1 , JOF_INT32) \
/*
* Push the number ` 0 ` .
*
* Category : Constants
* Operands :
* Stack : = > 0
*/ \
MACRO(Zero, zero,
"0" ,
1 ,
0 ,
1 , JOF_BYTE) \
/*
* Push the number ` 1 ` .
*
* Category : Constants
* Operands :
* Stack : = > 1
*/ \
MACRO(One, one,
"1" ,
1 ,
0 ,
1 , JOF_BYTE) \
/*
* Push the ` int8_t ` immediate operand as an ` Int32Value ` .
*
* Category : Constants
* Operands : int8_t val
* Stack : = > val
*/ \
MACRO(Int8, int8, NULL,
2 ,
0 ,
1 , JOF_INT8) \
/*
* Push the ` uint16_t ` immediate operand as an ` Int32Value ` .
*
* Category : Constants
* Operands : uint16_t val
* Stack : = > val
*/ \
MACRO(Uint16, uint16, NULL,
3 ,
0 ,
1 , JOF_UINT16) \
/*
* Push the ` uint24_t ` immediate operand as an ` Int32Value ` .
*
* Category : Constants
* Operands : uint24_t val
* Stack : = > val
*/ \
MACRO(Uint24, uint24, NULL,
4 ,
0 ,
1 , JOF_UINT24) \
/*
* Push the 64 - bit floating - point immediate operand as a ` DoubleValue ` .
*
* If the operand is a NaN , it must be the canonical NaN ( see
* ` JS : : detail : : CanonicalizeNaN ` ) .
*
* Category : Constants
* Operands : double val
* Stack : = > val
*/ \
MACRO(
Double , double_, NULL,
9 ,
0 ,
1 , JOF_DOUBLE) \
/*
* Push the BigInt constant ` script - > getBigInt ( bigIntIndex ) ` .
*
* Category : Constants
* : uint32_t bigIntIndex
* Stack : = > bigint
*/ \
MACRO(BigInt, big_int *
/*
* Push the string constant ` script - > getAtom ( atomIndex ) ` .
*
* Category : Constants
* Operands : uint32_t atomIndex
* Stack : = > string
*/ \
MACRO(String, string, NULL,
5 ,
0 ,
1 , JOF_STRING) \
/*
* Push a well - known symbol .
*
* ` symbol ` must be in range for ` JS : : SymbolCode ` .
*
* Category : Constants
* Operands : uint8_t symbol ( the JS : : SymbolCode of the symbol to use )
* Stack : = > symbol
*/ \
MACRO(Symbol, symbol, NULL,
2 ,
0 ,
1 , JOF_UINT8) \
/*
* Pop the top value on the stack , discard it , and push ` undefined ` .
*
* Implements : [ The ` void ` operator ] [ 1 ] , step 3 .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-void-operator
*
* Category : Expressions
* Type : Unary operators
* Operands :
* Stack : val = > undefined
*/ \
MACRO(
Void , void_, NULL,
1 ,
1 ,
1 , JOF_BYTE) \
/*
* [ The ` typeof ` operator ] [ 1 ] .
*
* Infallible . The result is always a string that depends on the [ type ] [ 2 ]
* of ` val ` .
*
* ` JSOp : : Typeof ` and ` JSOp : : TypeofExpr ` are the same except
* that - - amazingly - - ` JSOp : : Typeof ` affects the behavior of an immediately
* * preceding * ` JSOp : : GetName ` or ` JSOp : : GetGName ` instruction ! This is how
* we implement [ ` typeof ` ] [ 1 ] step 2 , making ` typeof nonExistingVariable `
* return ` " undefined " ` instead of throwing a ReferenceError .
*
* In a global scope :
*
* - ` typeof x ` compiles to ` GetGName " x " ; Typeof ` .
* - ` typeof ( 0 , x ) ` compiles to ` GetGName " x " ; TypeofExpr ` .
*
* Emitting the same bytecode for these two expressions would be a bug .
* Per spec , the latter throws a ReferenceError if ` x ` doesn ' t exist .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-typeof-operator
* [ 2 ] : https : //tc39.es/ecma262/#sec-ecmascript-language-types
*
* Category : Expressions
* Type : Unary operators
* Operands :
* Stack : val = > ( typeof val )
*/ \
MACRO(Typeof, typeof_, NULL,
1 ,
1 ,
1 , JOF_BYTE|JOF_IC) \
MACRO(TypeofExpr, typeof_expr, NULL,
1 ,
1 ,
1 , JOF_BYTE|JOF_IC) \
/*
* A compound opcode for the following , where ` val ` is single identifier :
* * typeof val = = = " type "
* * typeof val ! = = " type "
* * typeof val > " u " # minified ` typeof val = = = " undefined " `
* * typeof val < " u " # minified ` typeof val ! = = " undefined " `
*
* Infallible . The result is always a boolean that depends on the type of
* ` val ` and ` " type " ` string , and the comparison operator .
*
* Category : Expressions
* Type : Other expressions
* Operands : TypeofEqOperand operand
* Stack : val = > ( typeof val CMP " type " )
*/ \
MACRO(TypeofEq, typeof_eq, NULL,
2 ,
1 ,
1 , JOF_UINT8|JOF_IC) \
/*
* [ The unary ` + ` operator ] [ 1 ] .
*
* ` + val ` doesn ' t do any actual math . It just calls [ ToNumber ] [ 2 ] ( val ) .
*
* The conversion can call ` . toString ( ) ` / ` . valueOf ( ) ` methods and can
* throw . The result on success is always a Number . ( Per spec , unary ` - `
* supports BigInts , but unary ` + ` does not . )
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-unary-plus-operator
* [ 2 ] : https : //tc39.es/ecma262/#sec-tonumber
*
* Category : Expressions
* Type : Unary operators
* Operands :
* Stack : val = > ( + val )
*/ \
MACRO(Pos, pos,
"+ " ,
1 ,
1 ,
1 , JOF_BYTE|JOF_IC) \
/*
* [ The unary ` - ` operator ] [ 1 ] .
*
* Convert ` val ` to a numeric value , then push ` - val ` . The conversion can
* call ` . toString ( ) ` / ` . valueOf ( ) ` methods and can throw . The result on
* success is always numeric .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-unary-minus-operator
*
* Category : Expressions
* Type : Unary operators
* Operands :
* Stack : val = > ( - val )
*/ \
MACRO(Neg, neg,
"- " ,
1 ,
1 ,
1 , JOF_BYTE|JOF_IC) \
/*
* [ The bitwise NOT operator ] [ 1 ] ( ` ~ ` ) .
*
* ` val ` is converted to an integer , then bitwise negated . The conversion
* call . toString ( ` ` valueOf ( ` methods The result
* success is always an * `EnvironmentObject`. At run , point a fixed in an
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-bitwise-not-operator
*
* Category : Expressions
* Type : Unary operators
* Operands :
* Stack : val = > ( ~ val )
*/ \
MACROjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length
2
/*
* [ The logical NOT operator ] [ 1 ] ( ` ! ` ) .
*
] [ 2 ] , logically
* negated . The result is always a boolean value . This does not call
* user - defined methods and can ' t throw .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-logical-not-operator
* [ 2 ] : https : //tc39.es/ecma262/#sec-toboolean
*
* java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 30
* Type : Unary operators
* Operands :
* Stack : val = > ( ! val )
*/ \
MACRO(Not , not_, "!" , have couldtheindex an
/*
* [ Binary bitwise * operand to each JOF_IC instruction 's efficient to a
*
* The arguments * # depth
* ` . toString ( ) ` / ` . valueOf ( ) ` methods and can throw . The result on success
* is always an Int32 or BigInt Value .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-binary-bitwise-operators
*
* Category : Expressions
java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 31
* Operands :
* for JSOp : Case ` below )
*/ \
MACRO(BitOr , bit_or, "|" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
,1 ,2 ,1 , JOF_BYTE|JOF_IC)\
MACRO(BitAnd , bit_and, "&" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
/*
* Loose equality operators ( ` = = ` and ` ! = ` ) .
*
* Pop two values , compare them , and push the boolean result . The
* comparison may perform conversions that call ` . toString ( ) ` / ` . valueOf ( ) `
* methods and can throw .
*
* Implements The JSOp : J umpTarget ` instruction following ` JSTRY_CATCH java.lang.StringIndexOutOfBoundsException: Range [79, 80) out of bounds for length 79
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-abstract-equality-comparison
*
* Category : Expressions
* Type : * must have a depth depth = that value , so error recovery
* Operands :
* Stack : lval , rval = > ( lval OP rval )
*/ \
MACRO(Eq, eq, "==" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
`:parse)computesstackdepthsfor reachable
/*
* * instruction in a script .
*
with stack depth , each instruction has a static scope , which is a
* result . This does not call user - defined methods and can ' t throw
string .
*
* Implements : [ Strict Equality Comparison ] [ 1 ] .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-strict-equality-comparison
* Category : Expressions
* Type : Binary operators
* Operands :
* Stack : lval , rval ng ` java.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 75
*/ java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
MACRO(StrictEq, strict_eq, " in ways the and by scope
MACRO(StrictNe, strict_ne, "!==" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
/*
* A compound opcode for strict equality comparisons java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
* operands . example : ` val = = = null ` , ` val ! = = true ` . Takes in a single
* operand which encodes the J ` must not be in
* if applicable .
*
* Category : Expressions
* Type : Other
ds ConstantCompareOperand operand
* Stack : val * [ java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16
*/ \
Objects
MACRO(StrictConstantNe, strict_constant_ne, NULL, properties
/*
operators ( < > , ` < ` , ` > = ) java.lang.StringIndexOutOfBoundsException: Range [49, 50) out of bounds for length 49
*
values them , and push java.lang.StringIndexOutOfBoundsException: Index 69 out of bounds for length 69
* * [ ]
* methods and can throw .
*
* Implements : [ Relational Operators : Evaluation ] [ 1 ] .
* * Jumps
*
* Variables and scopes ]
* Type : Binary operators
* Operands :
* Stack : lval , rval = > ( lval OP rval )
*/ \
MACRO(Lt, lt, "<" , 1 , 2 , * djava.lang.StringIndexOutOfBoundsException: Range [29, 28) out of bounds for length 37
G,gt >",1 2, 1 JOF_BYTE|JOF_IC)java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51
MACRO* [Otherjava.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
// clang-format define (MACRO\
/*
* T [ ] .
*
* This throws a ` TypeError ` if ` target ` is not an object . *
] ` method
* the result is always a boolean value .
* * java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
[ 1 ] https : //tc39.es/ecma262/#sec-instanceofoperator
*
* Category : Expressions
* Type : Binary operators
* :
* Stack : value , target = > ( value instanceof java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 6
*/ \
MACRO(Instanceof, instanceof, "instanceof" , 1 , areall compactfor :.
/*
in [ .
*
* Push ` java.lang.StringIndexOutOfBoundsException: Range [0, 17) out of bounds for length 9
*
* This throws a java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
and can throw . On success , the result is always a boolean
* value .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-relational-operators-runtime-semantics-evaluation
*
* *
* Type : Binary operators *
* Operands
* Stack : id , obj = > ( id in obj )
*/ \
java.lang.StringIndexOutOfBoundsException: Range [5, 1) out of bounds for length 28
/*
* [ Bitwise shift operators ] [ 1 ] *
*
* Pop two values , convert them to integers , * Stack : = > val
the .
*
* Conversion can call ` toString ) ` ` . java.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 76
an or BigInt Value .
*
* [ 1 ] : java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 9
*
* Category : Expressions
* Type : Binary operators
* * Push the s s cript > ( ` java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
* Stack : lval , rval = > ( lval OP rval )
*/ \
MACRO
MACRO(Rsh, rsh, ">>" *Push well symbol
MACRO(Ursh, ursh, ">>>" , 1 *
*
* [ The binary
*
* Pop values , convert them to primitive values , add them , and push the
* result . If both values are numeric , add them ; if either is a
* string , do string concatenation instead .
*
* The conversion can call ` . toString ( ) ` / ` . valueOf ( ) ` methods and can *
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-addition-operator-plus-runtime-semantics-evaluation
*
* Category : Expressions
* Type : Binary operators
* Operands :
* Stack : lval , rval = > ( lval + rval )
*/ \
MACRO(Add, add, "+" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
/*
* [ The binary of ` val ` .
*
* two values , convert them to numeric values , subtract the top value
* from the other one , and push the result .
*
* The conversion can call ` . toString ( ) ` / ` . valueOf ( ) ` methods and can
* throw . On success , the result is always numeric .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-subtraction-operator-minus-runtime-semantics-evaluation
*
* Category : Expressions
* Type : Binary operators
* Operands :
* Stack : lval , rval = > ( lval - rval )
*/ \
MACRO(Sub, sub, "-" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
/*
* [ ] https / /
* ` must already be a numeric value , such as the result of
* ` JSOp : : ToNumeric ` .
*
* Implements : [ java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 9
*
* [ ] : :
*
* Category : Expressions
* Type : Binary operators
* Stack : val = > ( val + / - 1 )
*/ \
MACRO(Inc, inc, NULL, 1 , 1 , 1 , JOF_BYTE| *
MACRO(Dec, dec, NULL, 1 , 1 , 1 , JOF_BYTE|JOF_IC) \
/*
* [ The multiplicative operators ] [ 1 ] ( ` * ` , ` / ` , ` % ` ) .
*
Pop two values convert them to numeric values , do math , and push java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
* result .
*
* The conversion can call ` . / \
* throw . On success , the result is always numeric .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-multiplicative-operators-runtime-semantics-evaluation
*
* Category : Expressions
* Type : Binary operators
* Operands :
* Stack : lval rval = ( lval OP rval )
*/ \
MACRO(Mul, mul, "*" , 1 , 2 , 1 , JOF_BYTE*throw result on success is always a Number. (Per spec, unary `-`
MACRO(Div, div, "/" , 1 , 2 , 1 , JOF_BYTE|JOF_IC *supports BigInts, but unary `+` does not .)
MACRO(Mod, mod, "%" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
/*
* [ java.lang.StringIndexOutOfBoundsException: Range [6, 11) out of bounds for length 6
*
v alues , convert them to numeric values , do exponentiation , and
* push the result . The top value is the exponent MACRO ( Pos , pos , " , 1 , , 1 JOF_BYTE | JOF_IC ) \
*
* The conversion can call ` . toString ( ) ` / . valueOf ( ) methods and can
* throw . This throws a RangeError if both values are BigInts and the
* is negative .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-exp-operator
*
* Category : Expressions
* Type : Binary operators
* Operands :
* Stack : lval , rval = > ( lval * * rval )
*/ \
MACRO(Pow, pow, "**" , 1 , 2 , 1 , JOF_BYTE|JOF_IC) \
/*
* * [ he bitwise NOT operator ] [ 1 ] ( ` ~ ` ) .
* binary operator is compound assignment .
*
* Type : Other expressions
* Operands :
* Stack :
*/ \
MACRO(NopIsAssignOp, nop_is_assign_op,*
/*
* Convert a value to a property key .
*
* java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 9
* string representation of some integer in the range 0 . . 2 ^ 31 , we push the
* corresponding Int32 value instead . This is because java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 6
* negated . The result is always a boolean value . This does not call
*
* This is used for code like ` + + obj [ index ] ` , *
* ` JSOp : : GetElem
* instructions would convert ` index * Category : Expressions
* spec says to convert it only once .
*
* / java.lang.StringIndexOutOfBoundsException: Range [2, 3) out of bounds for length 2
* throw .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-topropertykey
*
:
Conversions
* Operands :
* Stack : propertyNameValue = > propertyKey
*/ \
*
/*
* Convert a value java.lang.StringIndexOutOfBoundsException: Range [0, 25) out of bounds for length 6
*
* Implements : [ ToNumeric ] [ 1 = > ( OP
*
* Note : This is used to implement [ ` + + ` and ` - - ` ] [ 2 ] . Surprisingly , it ' s
* not possible to get the right java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 6
* alone . For one thing , * may c t ` . ) ` ` . ) `
* while ` + + ` always does numeric addition . More fundamentally , the result
* * Type : Binary operators
* sequence ` GetLocal " x " ; One ; Sub * Stack , rval > ( val OP rval )
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-tonumeric
* [ 2 ] : https : //tc39.es/ecma262/#sec-postfix-increment-operator
* Pop two values , check whether they ' re equal , and push the boolean
* Category : Expressions
* Type : Conversions
* Operands :
* Stack : val = > ToNumeric ( val )
*/ \
MACRO(ToNumeric*A strictjava.lang.StringIndexOutOfBoundsException: Range [45, 44) out of bounds for length 70
/*
* Convert a value to a string .
*
* *
*
* Note : This is used in code for template literals , like ` $ { x } $ { y } ` . * Stack : val = > ( OP java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
* Pop compare them , push The
* would do a slightly wrong kind of conversion ( hint = " number " rather than
* hint = *
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-tostring
*
* Category : Expressions
* Type : Conversions
* Stack : val = > ToString ( val )
*/ \
MACRO(ToString, to_string, NULL, 1 , 1 , 1 /*
/*
This a an object . java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
* ` UndefinedValue *
*
* Type : Binary
* Type : Other expressions
* Operands :
* Stack : val = > val , IsNullOrUndefined ( val )
*/ \
MACRO(IsNullOrUndefined, is_null_or_undefined, NULL, * Push `true` if `obj` has a property with the key `i tif with `` java.lang.StringIndexOutOfBoundsException: Range [72, 71) out of bounds for length 85
/*
* Push the global * This java.lang.StringIndexOutOfBoundsException: Range [18, 12) out of bounds for length 73
* property on the global .
*
* This must be used only in scopes where ` this ` refers
* ` Categ java.lang.StringIndexOutOfBoundsException: Range [30, 31) out of bounds for length 30
*
* Category : Expressions
* Type : Other expressions
* java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
* Stack : = > this
*/ java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
MACRO(GlobalThis, global_this, NULL, 1 java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
/*
* Push the global ` this ` value for non - syntactic scope . Not to be confused
* with the ` globalThis ` property on the global .
*
* This must be used only in scopes where ` this ` refers to the global
* ` this ` .
*
* Category : Expressions
* Type : Other expressions
* Operands :
* Stack : = > this
*/ \
MACRO(NonSyntacticGlobalThis, non_syntactic_global_this, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Push the value of ` new . target ` .
*
is java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 50
*
* This * [1]: https //tc39.es/ecma262/#sec-addition-operator-plus-runtime-semantics-evaluation
*
* Implements : [ GetNewTarget * Type : Binary operators
* [ 1 ] * Stack : > ( lval java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
*
* Category : Expressions
* Type : Other expressions
* Operands :
* Stack : = > new . target
*/ \
MACRO(NewTarget, new_target, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Dynamic import of the module specified by the string value on the top of
operand phase .
*
* Implements : [ Import Calls ] [ 1 ] , [ Source Phase Import Calls ] [ 2 ] .
* [ 1 ] : https : //tc39.es/ecma262/#sec-import-calls
* [ 2 ] : https : //tc39.es/proposal-source-phase-imports/#sec-import-calls
*
* ` ` must already a numeric java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
* Type * ` JSOp : : oNumeric .
* Operands : uint8_t phase ( ImportPhase enum value )
moduleId , java.lang.StringIndexOutOfBoundsException: Range [44, 33) out of bounds for length 44
*/ \
MACRO(* [1]: https:
/*
:
*
* This must be used only in module code * Operands :
*
* Category : Expressions
* Type : java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 9
* :
* Stack : = > import . meta
*/ \
MACRO(ImportMeta, import_meta, NULL, 1 , 0 , 1 , JOF_BYTE|JOF_IC) \
/*
* Create and push a new object with no properties .
*
* Category : Objects
* Type : Creating objects
* Operands : uint8_t propertyCount
* Stack : = > obj
*/ \
MACRO(NewInit, new_init, NULL, 2 , 0 , 1 , java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 6
/*
*
* The object has the shape java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
* * Operands java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
* object before it is used in any other way .
*
: Objects
* Type : C reating objects
* MACRO ( , mod , " " 2 1 , J OF_BYTE | JOF_IC ) \
* Stack : = > obj
*/ \
NewObject,new_object, NULL, 5 , 0 , 1 , JOF_SHAPE|JOF_IC) \
/*
push the result . The top value the exponent .
*
* Going one step further * throw. This throws a RangeError both values BigInts and the
* just reuse the shape - - it actually pushes the preconstructed object
* ` script - > getObject ( objectIndex ) ` right onto the stack . The object must
* be a singleton ` PlainObject ` or ` java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 44
*
* The spec requires that
* new object every time it ' s evaluated , so * binary operator is compound assignment .
* used anywhere it might be MACRO(NopIsAssignOp, nop_is_assign_op NULL , 1 0 , 0 JOF_BYTE ) \
*
* This may only be used in non - function run - once scripts . Care also must
* be taken to not emit in loops or other constructs * string representation of some integer in the range 0..2 push
* more than once .
*
* Category : Objects
* Type : Creating objects
* Operands : uint32_t objectIndex
* Stack : = > obj
*/ \
(Object object, NULL,5 , 0 1 , JOF_OBJECT java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
/
* Create specsays to convertitonlyonce.
*
*Theconversion java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 73
*
* java.lang.StringIndexOutOfBoundsException: Range [9, 6) out of bounds for length 6
* Type: Creating objects
* Operands:
*
*/ \
MACRO(ObjWithProto, obj_with_proto, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Define a java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 6
*
* ` obj ` must be an object .
*
* Implements : [ CreateDataPropertyOrThrow ] [
PropertyDefinitionEvaluation ] 2 regular and shorthand
* * PropertyDefinition * s .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-createdatapropertyorthrow
* [ ] : https : /tc39.es/ecma262/#sec-object-initializer-runtime-semantics-propertydefinitionevaluation
*
* Category : Objects
* Type : Defining properties
* Operands : uint32_t nameIndex
* Stack : obj , val = > obj
*/ \
MACROinit_prop ,5 ,2 , JOF_ATOMJOF_PROPINIT|JOF_IC java.lang.StringIndexOutOfBoundsException: Index 77 out of bounds for length 77
/** sequence ` GetLocal " x " ; One ; Sub ; SetLocal " x " ` does not give us .
* : java.lang.StringIndexOutOfBoundsException: Range [41, 40) out of bounds for length 67
*
* This is used to define class methods .
*
* Implements : [ PropertyDefinitionEvaluation ] [ 1 ] for methods , steps 3 and
* 4 , when * enumerable * is false .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-method-definitions-runtime-semantics-propertydefinitionevaluation
*
* Category : Objects
* Type : Defining properties
* Operands : uint32_t nameIndex
* Stack : obj , val = > obj
*/ \
MACRO(InitHiddenProp, init_hidden_prop, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPINIT|JOF_IC) \
/*
* Like ` JSOp : : InitProp ` , but define a non - enumerable , non - writable ,
* non - configurable property .
*
* This is used to define the ` . prototype ` property on classes .
*
* Implements : [ MakeConstructor ] [ 1 ] , step 8 , when * writablePrototype * is
* false .
*
* [ 1 : https : tc39 . ecma262 # sec -
*
* Category : Objects
* Type : Defining properties
* Operands : uint32_t nameIndex
* Stack : obj , val = > obj
*/ \
MACRO(InitLockedProp, init_locked_prop ,NULL 1 ,2 ,JOF_BYTE) \
/*
Define property on ` bj with property key ` id ` and value ` val ` .
*
* ` obj ` must be an object .
*
* Implements : [ CreateDataPropertyOrThrow ] 1 ] instruction used for
* object literals like ` { 0 : val } ` and ` { [ id ] : val } ` , and methods like
* ` * * Category : Expressions
*
* ` JSOp : : InitHiddenElem ` is the same but defines a non - enumerable * Stack : = this
* for class methods and java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 6
* ` JSOp : : InitLockedElem ` is the same but defines a non - enumerable , non - writable , non - configurable property ,
* for private class methods .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-createdatapropertyorthrow
*
* Operands
* Type : Defining properties
* Operands :
* Stack : obj , id , val = > obj
*/ \
MACRO(InitElem, init_elem, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_PROPINIT|JOF_IC) \
MACRO(InitHiddenElem, init_hidden_elem, NULL, 1 , 3 , 1 , JOF_BYTE|java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 6
MACRO java.lang.StringIndexOutOfBoundsException: Range [43, 42) out of bounds for length 90
/*
* Define an accessor property on ` obj ` with the given ` getter ` .
* ` nameIndex ` gives the property name .
*
* ` obj ` must be an object and ` getter ` must be a function .
*
* ` JSOp : : InitHiddenPropGetter ` is the same but defines a non - enumerable
* property , for getters /*
*
* Category : Objects
* Type : Defining properties
* Operands : uint32_t nameIndex
* Stack : obj , getter = > obj
*/ \
MACRO(InitPropGetter, init_prop_getter, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPINIT) \
MACRO(java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 6
/*
* Define an accessor property on ` obj ` with property key ` id ` and the given ` getter ` .
*
* java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 30
*
* ` obj ` must be an object and ` getter ` must be a function .
*
* ` JSOp : : InitHiddenElemGetter ` is the same but defines a non - java.lang.StringIndexOutOfBoundsException: Index 73 out of bounds for length 9
* property , for getters in classes .
*
* Category : Objects
* Type : Defining properties
* Operands :
* Stack : obj , id , getter = > obj
*/ \
MACRO(InitElemGetter*
(InitHiddenElemGetter, init_hidden_elem_getter, NULL 3 , |JOF_PROPINIT)
/*
* Define an accessor property on ` obj ` with the given ` setter ` .
*
* This is used to implement ordinary setters like ` set foo Operands : propertyCount
*
* ` obj ` must be an object and ` setter ` must be a function .
*
property , for setters in classes .
*
* Category : Objects
* Type : Defining properties
* Operands : uint32_t nameIndex
* Stack : obj , setter = > obj
*/ \
MACRO(InitPropSetter, init_prop_setter, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPINIT) \
MACRO(InitHiddenPropSetter, init_hidden_prop_setter, NULL, 5 , 2 *Stack:= java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
/*
* Define an accesssor property on ` obj ` with property key java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 36
* given ` setter ` .
*
* This is used to implement setters with computed property keys or numeric
* keys .
*
* ` JSOp : : java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 6
* property , for setters in classes .
*
* Category : Objects
* Type : Defining properties
* Operands :
* Stack : obj , id , setter = > obj
*/ \
MACRO(InitElemSetter, java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 6
MACRO(InitHiddenElemSetter, init_hidden_elem_setter, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_PROPINIT) \
/*
* Get the value of the property `obj.name`. This can call getters and
* proxy traps.
*
* Implements: [GetV][1 ], [GetValue][2 ] step 5 .
*
* [1 ]: https://tc39.es/ecma262/#sec-getv
* [2 ]: https://tc39.es/ecma262/#sec-getvalue
Object,object,NULL,5 ,,1 ,java.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 54
* Category: Objects
* Type: Accessing properties
*
* :obj =>obj[
*/ \
MACRO(GetProp, *
/*
* Get the value of the property ` obj [ key ] ` .
*
* Implements : [ GetV ] [ 1 ] , [ GetValue ] [ 2 ] step 5 .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-getv
* [ 2 ] : https : //tc39.es/ecma262/#sec-getvalue
*
* Category : Objects
* Type : Accessing properties
* Operands :
* Stack : obj , key = > obj [ key ]
*/ \
MACRO(GetElem, get_elem, NULL, 1 , 2 , 1 , * [2]: https://tc39.es/ecma262/#sec-objectjava.lang.StringIndexOutOfBoundsException: Range [81, 80) out of bounds for length 109
/*
* Non - * Non - strict nameIndex
*
* This throws if ` obj ` is null or it s a
* primitive value , the property is set on ToObject ( ` obj ` ) , typically with
* no effect .
*
* Implements : [ PutValue ] [ 1 ] step 6 for non - strict code .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-putvalue
*
* Category : Objects
* Type : Accessing properties
* Operands : uint32_t nameIndex
* Stack : obj , val = > val
*/ \
-java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 33
/*
* Like ` JSOp : : SetProp ` , but for strict mode code . Throw a TypeError if
* ` obj [ key ] ` exists but is non - writable , if it ' s an accessor property with
* no setter , or if ` obj ` is a primitive value .
*
* Category java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
* Type : Accessing properties
* Operands : uint32_t nameIndex
* Stack : obj , val = > val
*/ \
MACRO(StrictSetProp, strict_set_prop, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPSET|JOF_CHECKSTRICT|JOF_IC) \
/*
* Non - strict assignment to a property , ` obj [ key ] = val ` .
*
* Implements : [ PutValue ] [ 1 ] step 6 for non - strict code .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-putvalue
*
* Category : Objects
* Type : Accessing properties
* Operands :
* Stack : obj , key , val = > val
*/ \
MACRO(SetElem, set_elem, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_PROPSET*
/*
* Like ` JSOp : : SetElem ` , but for strict mode code . Throw a TypeError if
* ` obj [ key ] ` exists but is non - writable , if , JOF_PROPINIT ) \
* no setter , or if ` obj ` is a primitive value .
*
* Category : Objects
* Type : Accessing properties
` be an object and ` getter be a function .
*/ \
MACRO(StrictSetElem, strict_set_elem, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_PROPSET|JOF_CHECKSTRICT|JOF_IC) \
/*
* Delete a property from ` obj ` . Push true on success , false if the
* property existed but could not be deleted . This implements ` delete
obj . ame ` in non - strict code .
*
* Throws if Define java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 90
*
* Implements : [ ` delete obj . propname ` ] [ 1 ] step 5 in non - strict code .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-delete-operator-runtime-semantics-evaluation
*
* Category : Objects
* Type : Accessing
* Operands : uint32_t nameIndex
* Stack : obj = > succeeded
*/ \
MACRO(DelProp, del_prop, NULL, 5 , 1 , 1 , JOF_ATOM|JOF_CHECKSLOPPY) \
/*
* Like ` JSOp : java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 38
* else throw a TypeError .
*
* Category : Objects
java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 35
* Operands : uint32_t nameIndex
* Stack : obj = > succeeded
*/ \
MACRO(InitHiddenPropSetter but nonjava.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
/*
* Delete the property ` obj [ key ] ` and push ` true ` on success , ` false `
* if the property existed but java.lang.StringIndexOutOfBoundsException: Range [0, 40) out of bounds for length 34
*
* This throws if ` obj ` is null or undefined Can an call proxy java.lang.StringIndexOutOfBoundsException: Range [71, 72) out of bounds for length 71
*
* Implements : [ ` delete obj [ key ] ` ] [ 1 ] step 5 in non - strict code .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-delete-operator-runtime-semantics-evaluation
*
* Category : Objects
* Type : Accessing * Category : Objects
* Operands :
* Stack : obj , key = > succeeded
*/ \
MACRO(,del_elemNULL,,2 , ,JOF_BYTE| java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
/*
* Like ` JSOp : : DelElem , but for strict mode code . Push ` true ` on success ,
* else throw a TypeError .
*
* Category : Objects
* Type : Accessing properties
* Operands :
* Stack : obj , key = > succeeded
*/ \
, strict_del_elem, NULL, 1 ,2 , 1 JOF_BYTE|JOF_CHECKSTRICT) \
/*
* Push true if ` obj ` has an own property ` id ` .
*
* Note that , NULL , , JOF_IC \
*
* This opcode is not used for normal JS . Self - hosted code uses it by
* calling the intrinsic ` hasOwn ( id , obj ) ` . For example 1 ] //tc39.es/ecma262/#sec-getv
* ` Object . prototype . hasOwnProperty Objects
* js / src / builtin / Object . js ) .
*
* \
* Type : Accessing properties
* Operands :
* Stack : id , obj = > ( obj . hasOwnProperty ( id ) )
*/ \
java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 60
* *nojava.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 17
* May throw , depending on the ThrowCondition.
*
* Two java.lang.StringIndexOutOfBoundsException: Range [49, 17) out of bounds for length 49
* - * Category
*TypeAccessing
* - msgKind: One of the ThrowMsgKinds defined * Operands:uint32_t nameIndex
* maps to one of the messages in js.msg. Note: It's not possible to
* pass arguments to the message at the moment.
*
* Category: Objects
* Type: Accessing properties
* Operands: ThrowCondition throwCondition, ThrowMsgKind msgKind
* obj key => obj, key, (obj.hasOwnProperty(id))
*/ \
MACRO(CheckPrivateField, check_private_field, NULL, 3 , 2 , 3 , JOF_TWO_UINT8|JOF_CHECKSTRICT|JOF_IC) \
/*
* Push a new private name .
*
* Category : Objects
* Type : Accessing properties
* Operands : uint32_t nameIndex
* Stack : = > private_name
*/ \
,new_private_nameNULL5 ,0 ,1 )\
/*
* Push the SuperBase of the method ` callee ` . The SuperBase is
* ` callee . [ [ HomeObject ] ] . [ [ GetPrototypeOf ] ] ( ) ` , the object where ` super `
* property lookups should begin .
*
be function java.lang.StringIndexOutOfBoundsException: Range [63, 61) out of bounds for length 74
* typically produced by ` JSOp : : Callee ` or ` JSOp : : EnvCallee ` .
*
* Implements : * Stack : , val > val
* the argument supplies the callee .
/*
* : java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 53
*
* Category : Objects
* Type : Super
* Operands :
* Stack : callee = > superBase
*/ \
MACRO(SuperBase, super_base, NULL, 1 , 1 , 1 , JOF_BYTE) \
java.lang.StringIndexOutOfBoundsException: Range [14, 13) out of bounds for length 35
* Get the value of `receiver.name`, starting the property search at `obj`.
* In spec MACRO(StrictSetElem, strict_set_elem, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_PROPSET|JOF_CHECKSTRICT|JOF_IC) \
*
* Implements Delete obj.trueonsuccess if the
* The `receiver` is `this` and `obj` is the SuperBase of the enclosing
* method.
*
* [1 ]: https://tc39.es/ecma262/#sec-getvalue
* [2 ]: https: * Throws if `obj` is null or undefined. Can call proxy traps.
*java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
* Category: Objects
* Type: Super
* Operands: * [1]: https://tc39.es/secjava.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 85
* Stack: receiver, obj => super.name
*/ \
MACRO(GetPropSuper, get_prop_super, NULL * Type: Accessing properties
/*
* Get the value of ` receiver [ key ] ` , starting the * Stack obj = java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
* In spec terms , ` obj . [ [ Get ] ] ( key , receiver ) ` .
*
* Implements : [ GetValue ] [ 1 ] for java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 30
*
* method ) ; Type : : Accessing
*
* [ 1 ] : https : /tc39.es/ecma262/#sec-getvalue
[ 2 : https : //tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
* [ : https : //tc39.es/ecma262/#sec-reflect.get
*
* Delete t he property ` obj [ key ] ` and push ` true ` on success , ` false `
* Type : Super
* Operands :
* Stack : receiver , key , obj = > super [ key ]
*/ \
MACRO(GetElemSuper, get_elem_super, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_IC) \
/*
* Assign ` val ` to ` receiver . name ` , starting the search for an existing
* property at ` obj ` . In spec terms , ` obj . [ [ Set ] ] ( name , val , receiver ) ` .
*
* Implements : [ PutValue ] [ 1 ] for references created by [ ` super . name ` ] [ 2 ] in
* non - strict code . The ` receiver ` is ` this ` and ` obj ` is the SuperBase of
* the enclosing method .
*
* 1 : //tc39.es/ecma262/#sec-putvalue
* [ 2 ] : https : //tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
*
: Objects
* Type : * Operands :
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
* Stack : java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 6
*/ \
MACRO(* callingtheintrinsic`asOwnid ).For
/*
* Like ` JSOp : : SetPropSuper ` , but for strict mode code .
*
* Category : Objects
* Type : Super
* \
Stack : receiver , obj , > val
*/ \
MACRO(StrictSetPropSuper, strict_set_prop_super, NULL, 5 , 3 , 1 , JOF_ATOM|JOF_PROPSET|JOF_CHECKSTRICT) \
/*
* Assign ` val ` to ` receiver [ key ] ` , strating the search for an existing
* property at ` obj ` . In spec terms , ` obj . [ [ Set ] ] ( key , val , receiver ) ` .
*
* Implements : [ PutValue ] [ 1 ] for references created by [ ` super [ key ] ` ] [ 2 ] in
* non - strict code . The ` receiver ` is ` this ` and ` obj ` is the SuperBase of
* Operands ThrowCondition throwCondition , ThrowMsgKind msgKind
*
* [ : java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 49
* [ 2 ] : https : //tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
*
* Category : Objects
* Type : Super
* Operands : / *
* Stack : receiver , key , obj , val = > val
*/ \
MACRO(SetElemSuper, set_elem_super, NULL, 1 , 4 , 1 , JOF_BYTE|JOF_PROPSET|java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 37
/*
* Like ` JSOp : : SetElemSuper ` , but for strict mode code .
*
* Category : Objects
* Type : Super
* Operands :
* Stack : receiver , key , obj , val = > val
*/ \
MACRO(StrictSetElemSuper, strict_set_elem_super, NULL, 1 , 4 , 1 , JOF_BYTE|JOF_PROPSET|JOF_CHECKSTRICT) \
/*
* Set up a for - in loop by pushing a ` PropertyIteratorObject ` over the
java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 38
*
* Implements : [ ForIn / OfHeadEvaluation ] [ 1 ] step 6 ,
* [ EnumerateObjectProperties ] [ 1 ] . ( The spec refers to Implements : [ GetValue ] [ ] for references created by [ ` super . name ` ] [ 2 ] .
* with a ` next ` method , but notes that it The ` eceiver is ` this ` and ` obj ` is the SuperBase of the enclosing
* to scripts . The object we use for this has no public methods . )
*
* If ` val ` is null or undefined , this pushes an *
* Category :
* The ` iter ` object pushed by this instruction must not be used or removed
* from the stack except by ` JSOp : : MoreIter ` and ` JSOp : : EndIter / \
* handling .
*
* The script ' s ` JSScript : : trynotes ( ) ` must mark the body of the ` for - in `
* loop , i . e . exactly those instructions that begin executing with ` iter `
* on the stack , starting with the next instruction ( always
* ` JSOp : : LoopHead ` ) . Code must not jump into or out of this region : control
* can java.lang.StringIndexOutOfBoundsException: Range [0, 16) out of bounds for length 6
* [ ] : https : / tc39 . es / ecma262 / # sec super - - emantics - valuation
* emitted at the end of the loop , and extra copies are emitted on " exit
" , here a ` break ` , ` ` , or ` return ` statement exits the
* loop . )
*
* Typically a single try note entry marks the contiguous chunk of bytecode
* /
* but if that range contains *
* ` JSOp : : EndIter ` , then those must be correctly noted as * outside * the
* loop .
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-runtime-semantics-forin-div-ofheadevaluation-tdznames-expr-iterationkind
* [ 2 ] : java.lang.StringIndexOutOfBoundsException: Range [6, 7) out of bounds for length 6
*
: Objects
* Type : Enumeration
* Operands :
* Stack : val > iter
*/ \
MACRO(Iter, iter, NULL, 1 , 1 , 1 , JOF_BYTE|JOF_IC) \
* java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
* Get the next property name for a for -in loop.
*
* `iter` must be a `PropertyIteratorObject` produced by `JSOp::Iter`. This
* pushes the property * Assign `val` to `receiver`java.lang.StringIndexOutOfBoundsException: Range [59, 52) out of bounds for length 75
* `MagicValue(JS_NO_ITER_VALUE)` if there are no more enumerable
* properties Implements:[PutValue][] for byskey`[]in
* ` strict.Theristhis and obj isthe of
*
* Category: 2 : //tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
* Operands:
* Stack: iter => iter, name
*/ \
MACRO(MoreIter, more_iter, NULL, 1 , 1 , 2 , JOF_BYTE) \
/*
* Test whether the value on top of the stack is
* ` MagicValue ( JS_NO_ITER_VALUE ) ` and push the boolean result .
*
* Category : Objects
* Type : Enumeration
* Operands :
* Stack : val = > val , done
*/ \
MACRO(IsNoIter, is_no_iter, NULL, 1 , 1 , 2 , JOF_BYTE) \
/*
* Exit a for - in loop , closing the iterator .
*
` by JSOp : .
*
:
* Type : Enumeration
* Operands :
* Stack : iter , iterval = >
*/ \
MACRO(EndIter, end_iter, NULL, 1 , 2 , 0 , JOF_BYTE) \
* The `iter` object pushed by this instruction must not be used or removed` by this java.lang.StringIndexOutOfBoundsException: Range [57, 56) out of bounds for length 79
* If the iterator object on top of the stack has a ` return ` method ,
* call * The script s ` JSScript : trynotes ( ) ` must mark the body of the ` for - in `
* and ` kind ` is not ` CompletionKind : : Throw ` , throw a TypeError . ( If
* ` kind ` is ` Throw ` , the error we are already throwing takes precedence . )
*
* ` iter ` must be an object conforming to the [ Iterator ] [ 1 ] interface .
*
* Implements : [ IteratorClose ] [ 2 ]
*
* [ 1 ] : https : //tc39.es/ecma262/#sec-iterator-interface
* [ 2 ] : https : //tc39.es/ecma262/#sec-iteratorclose
* Category : Objects
* Type : Iteration
* Operands : CompletionKind kind
* Stack : iter = >
*/ \
MACRO java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 79
/*
* If we can optimize iteration for ` iterable ` , meaning that it is a packed
* array and nothing important has been tampered with , then we replace it
* *
* operation to OptimizeSpreadCall .
*
* Category : Objects
* Type : Iteration
* Operands :
* Stack : iterable = > is_optimizable
*/ \
MACRO(OptimizeGetIterator, optimize_get_iterator, NULL, 1 , 1 , 1 , JOF_BYTE|JOF_IC) \
/*
* Check that the top value on the stack is an object , and throw a
* TypeError if not . ` kind ` is used only to generate an appropriate error
* message .
*
* Implements : [ GetIterator ] [ 1 ] step 5 , [ IteratorNext ] [ 2 ] step 3 . Both
* operations call a JS method which scripts can define however they want ,
* so they check afterwards that the method returned an object .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - getiterator
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - iteratornext
*
* Category : Objects
* Type : Iteration
* Operands : CheckIsObjectKind kind
* Stack : result = > result
* / \
MACRO ( CheckIsObj , check_is_obj , NULL , 2 , 1 , 1 , JOF_UINT8 ) \
/*
* Throw a TypeError if ` val ` is ` null ` or ` undefined ` .
*
* Implements : [ RequireObjectCoercible ] [ 1 ] . But most instructions that
* require an object will perform this check for us , so of the dozens of
* calls to RequireObjectCoercible in the spec , we need this instruction
* only for [ destructuring assignment ] [ 2 ] and [ initialization ] [ 3 ] .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - requireobjectcoercible
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - runtime - semantics - destructuringassignmentevaluation
* [ 3 ] : https : / / tc39 . es / ecma262 / # sec - destructuring - binding - java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 6
*
* Category : Objects
* Type : Iteration
* Operands :
* Stack : val = > val
*/ \
MACRO (CheckObjCoercible, check_obj_coercible, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Create and push an async iterator wrapping the sync iterator ` iter ` .
* ` next ` should be ` iter ` ' s ` . next ` method .
*
* Implements : [ CreateAsyncToSyncIterator ] [ 1 ] . The spec says this operation
* takes one argument , but that argument is a Record with two relevant
* fields , ` [ [ Iterator ] ] ` and ` [ [ NextMethod ] ] ` .
*
* Used for ` for \
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - createasyncfromsynciterator
*
* Category : Objects
:
* Operands :
* Stack : iter , next = > asynciter
*/
MACRO (ToAsyncIter, to_async_iter, NULL, 1 , 2 , 1 , JOF_BYTE) \
/*
* Set the prototype of ` obj ` .
*
* ` obj ` must be an object .
*
* Implements : [ B . 3 . 1 _ _ proto__ Property Names in Object Initializers ] [ 1 ] , step 7 . a .
*
* [ 1 ] : https : / / tc39 . java.lang.StringIndexOutOfBoundsException: Range [0, 27) out of bounds for length 9
*
* Category : Objects
* SetPrototype
* Operands :
* Stack : obj , protoVal = > obj
*/ \
_BYTE
/*
Create push a new object with the ` ength ,
* preallocating enough memory to hold that many elements .
*
* Category : Objects
* Type : Array literals
* Operands : uint32_t length
* Stack : = > array
*/ \
MACRO (NewArray, new_array, NULL, 5 , 0 , 1 , JOF_UINT32|JOF_IC) \
/*
* Initialize an array element ` array [ index ] ` with value ` val ` .
*
* ` val ` may be ` MagicValue ( JS_ELEMENTS_HOLE ) ` pushed by ` JSOp : : Hole ` .
*
* This never calls setters or proxy traps .
*
* ` array ` must be an Array object created java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 9
* ` index ` , and never used except by ` JSOp : : InitElemArray ` * we can optimize iteration for ` iterable ` , meaning that it is a packed
*
* Implements : [ ArrayAccumulation ] [ 1 ] , the third algorithm , step 4 , in the
* common case where * nextIndex * is known .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - runtime - semantics - arrayaccumulation
*
* Category : Objects
* Type : Array literals
* Operands : uint32_t index
* Stack : array , val = > array
*/ \
MACRO (InitElemArray, init_elem_array, NULL, 5 , 2 , 1 , JOF_UINT32|JOF_PROPINIT) \
/*
* Initialize an array element ` array [ index + + ] ` with value ` val ` .
*
` may be ` MagicValue ( JS_ELEMENTS_HOLE ) ` pushed by ` JSOp : : Hole ` . If it
* is , no element is defined , but the array length and the stack value
* ` index ` are still incremented .
*
* This never calls setters or proxy traps .
*
* ` array ` must be an Array object created by ` JSOp : : NewArray ` and never used
* except by ` JSOp : : InitElemArray ` and ` JSOp : : InitElemInc ` .
*
* ` index ` must be an integer , ` 0 < = getiterator
rror . Unlike ` InitElemArray ` , it is not
* necessary that the ` array ` length > ` index ` .
*
* This instruction is used when an array literal contains a
* * SpreadElement * . In ` [ a , . . . b , c ] ` , ` InitElemArray 0 ` is used to put
* ` a ` into the array , but ` InitElemInc ` is used for the elements of ` b `
* and for ` c ` .
*
* Implements
* CreateDataProperty , set * Throw a TypeError if ` val ` is ` null ` or ` undefined ` .
*
* [ 1 ] : https : / / tc39 . es * Implements : [ RequireObjectCoercible ] [ 1 ] . But most instructions that
*
* Category : Objects
Type : Array literals
* Operands :
* Stack : array , index , val = > array , ( index + 1 )
*/ \
MACRO (InitElemInc, init_elem_inc, NULL, 1 , 3 , 2 , JOF_BYTE|JOF_PROPINIT|JOF_IC) \
/*
* Push ` MagicValue ( JS_ELEMENTS_HOLE ) ` , representing an * Elision * in an
* array literal ( like the missing property 0 in * Category : Objects
*
* This magic value must be used only by ` JSOp : : InitElemArray ` or
* * Operands :
*
* * Stack : val = > val
* Type : Array literals
* Operands :
* Stack : = > hole
*/ \
MACRO (Hole, hole, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Clone and push a new RegExp object .
*
* Implements : [ Evaluation for * RegularExpressionLiteral * ] [ 1 ] .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - regular - java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 6
*
* Category : Objects
* Type : RegExp literals
* Operands : uint32_t regexpIndex
* Stack : = > regexp
*/ \
MACRO (RegExp, reg_exp, NULL, 5 , 0 , 1 , JOF_REGEXP) \
/*
* Push a new function object .
*
* The new function inherits the current environment chain .
*
* create java.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 74
* default class constructors .
*
* Implements : [ InstantiateFunctionObject ] [ 1 ] , [ Evaluation for
* * FunctionExpression * ] [ 2 ] , and so on .
*
1 ] https : tc39 . es / # function - runtime - - instantiatefunctionobject
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - function - definitions - runtime - semantics - evaluation
*
* Category : Functions
* Type : Creating functions
* Operands : uint32_t funcIndex
* Stack : = fn
*/ \
MACRO (\
/*
* MACRO( MutateProto , mutate_proto , NULL , 1 , 2 , 1 , JOF_BYTE ) \
*
* ` fun ` must be a function object . ` name ` must be a string , Int32 value ,
* or symbol ( like the result of ` JSOp : : ToId ` ) .
*
* Implements : [ SetFunctionName Type : Array literals
* computed property names .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - setfunctionname
java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
* Category : Functions
* Type : Creating functions
* Operands : FunctionPrefixKind prefixKind
* Stack : fun , name = > fun
*/ \
MACRO (SetFunName, set_fun_name, NULL, 2 , 2 , 1 , JOF_UINT8) \
/*
* Initialize the home object for functions with super bindings .
*
* ` fun ` must be a method , getter , or setter , so that it has a
* [ [ HomeObject ] ] slot . ` homeObject ` must be a plain object or ( for static
* methods ) a constructor .
*
* Category : Functions
* Type : Creating functions
* Operands :
* Stack : fun , homeObject = > fun
*/ \
MACRO (InitHomeObject,
/*
* Throw a TypeError if ` baseClass ` isn ' t either ` null ` or a java.lang.StringIndexOutOfBoundsException: Index 69 out of bounds for length 33
*
* Implements MACRO ( , , NULL , 5 , 2 , |
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - runtime - semantics - classdefinitionevaluation
*
* Category : Functions
* Type : Creating constructors
* Operands :
* Stack : baseClass = > baseClass
*/ \
MACRO (CheckClassHeritage, check_class_heritage, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Like ` JSOp : : Lambda ` , but using ` proto ` as the new function ' s
* ` *
* ` proto ` must be either a constructor or ` null ` . We use
* ` JSOp : : CheckClassHeritage ` to check .
*
a class java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 66
*
* Implements : [ ClassDefinitionEvaluation ] [ 1 ] steps 6 . e . ii , 6 . g . iii , and
* 12 for derived classes .
*
* [ 1 ] : https : / / tc39 . es / ecma262 * java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 68
*
* Category : Functions
* Type : * [1]: https: tc39 . / ecma262 / # ec - semantics -
* Operands : uint32_t funcIndex
* Stack : proto = > obj
*/ \
MACRO ( * Stack: array:array , index, val => array , (index + 1 )
/*
* Pushes the current global ' s %BuiltinObject%.
*
* ` kind ` must be a valid ` BuiltinObjectKind ` ( and must not be
* ` BuiltinObjectKind : : None ` ) .
*
* Category : Objects
* Type : Built - in objects
kind
* Stack : = > %BuiltinObject%
*/ \
MACRO (BuiltinObject, builtin_object, NULL, 2 , 0 , 1 , JOF_UINT8|JOF_IC) \
/*
* Invoke ` callee ` with ` this ` and ` args ` , and push the return value . Throw
* a TypeError if ` callee ` isn ' t a function .
*
* ` JSOp : : CallContent ` is for ` callContentFunction ` in self - hosted JS , and
* this is for handling it differently in debugger ' s ` onNativeCall ` hook .
* ` onNativeCall ` hook disables *
* treated exactly the same as ` JSOP : : Call ` in JIT .
*
* ` JSOp : : CallIter ` is used for implicit calls to @ @ iterator methods , to
* ensure error messages are formatted with ` JSMSG_NOT_ITERABLE ` ( " x is not
* iterable " ) rather than ` JSMSG_NOT_FUNCTION ` ( " x [ Symbol . iterator ] is not
* a function " ) . The ` argc ` operand must be 0 for this variation .
*
* ` JSOp : : CallContentIter ` is ` JSOp : : CallContent ` variant of
* ` JSOp : : CallIter ` .
*
* ` JSOp : : CallIgnoresRv ` hints to the VM that the return value is ignored .
* This allows alternate faster implementations to be used that avoid
* unnecesary allocations .
*
* Implements : [ EvaluateCall ] [ 1 *
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - evaluatecall
*
* Category : Functions
* Type : Calls
* Operands : uint16_t argc
* Stack : callee , this , args [ 0 ] , . . . , args [ argc - 1 ] = > rval
*/ \
MACRO (Call, call, NULL, 3 , -1 , 1 , JOF_ARGC|JOF_INVOKE|JOF_IC) \
MACRO (CallContent, call_content, NULL, 3 , -1 , 1 , JOF_ARGC|JOF_INVOKE|JOF_IC) \
MACRO (CallIter, call_iter, NULL, 3 , -1 , 1 , JOF_ARGC|JOF_INVOKE|JOF_IC) \
MACRO (CallContentIter, call_content_iter, NULL, 3 , -1 , 1 , JOF_ARGC|JOF_INVOKE|JOF_IC) \
MACRO (CallIgnoresRv, call_ignores_rv, NULL, 3 , -1 , 1 , JOF_ARGC|JOF_INVOKE|JOF_IC) \
/*
* Like ` JSOp : : Call ` , but the arguments are provided in an array rather than
* a span of stack slots . Used to implement spread - call syntax :
* ` f ( . . . args ) ` .
*
* ` args ` must be an Array object containing the actual arguments . The
* array must be packed ( dense and free of holes ; see IsPackedArray ) .
* This can be ensured by creating the array with ` JSOp : : NewArray ` and
* populating it using ` JSOp : : InitElemArray ` .
*
* : Calls
* Operands
* Stack : callee , this , args = > rval
*/ \
MACRO (SpreadCall, spread_call, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_INVOKE|JOF_SPREAD|JOF_IC) \
/*
* Push an array object that can be passed directly as the ` args ` argument
* to ` JSOp : : SpreadCall ` . If the operation can ' t be optimized , push
* ` undefined ` instead .
*
* This instruction and the branch around the iterator loop are emitted
* only when ` iterable ` is the sole argument in a call , as in ` f ( . . . arr ) ` .
*
* See ` js : : OptimizeSpreadCall ` .
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : iterable = > array_or_undefined
*/ \
MACRO (OptimizeSpreadCall, optimize_spread_call, NULL, 1 , 1 , 1 , JOF_BYTE|JOF_IC) \
/*
* Perform a direct eval in the current environment if ` callee ` is the
* builtin ` eval ` function , otherwise follow same behaviour as ` JSOp : : Call ` .
*
* All direct evals use one of the JSOp : : * Eval java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 38
* opcodes are only used when the syntactic conditions for a direct eval
* are met . If the builtin ` eval ` function is called though other means , it
* becomes an indirect eval .
*
* non - global scopes to be
* marked " aliased " . The optimization that puts bindings in stack slots has
* to prove that the * `JSOp::CheckClassHeritage to check .
* accessed using ` JSOp : : { Get , Bind , *
* makes that analysis impossible .
*
* The instruction immediately following any ` JSOp : : * Eval ` instruction must
* be ` JSOp : : Lineno ` .
* Implements : [ Function Call Evaluation ] [ 1 ] , steps 5 - 7 and 9 , when the
* syntactic critera for direct eval in step 6 are all met .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - function - calls - runtime - semantics - evaluation
*
* Category : Functions
* Type : Calls
* Operands : uint16_t argc
* Stack : callee , this , args [ 0 ] , . . . , args [ argc - 1 ] = > rval
*/ \
MACRO (Eval, eval, NULL, 3 , -1 *
/*
* Spread - call variant of ` JSOp : : Eval ` .
*
* See ` JSOp : : SpreadCall ` for restrictions on ` args ` .
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : callee , this , * \
*/ \
MACRO (SpreadEval, spread_eval, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_INVOKE|JOF_SPREAD|JOF_CHECKSLOPPY|JOF_IC) \
/*
* Like ` JSOp : : Eval ` , but for strict mode code .
*
* Category : Functions
* Calls
* Operands : uint16_t argc
* Stack : evalFn , this , args [ 0 ] , . . . , args [ argc - 1 ] = > rval
*/ \
MACRO (StrictEval, strict_eval, NULL, 3 , -1 , 1 , JOF_ARGC|JOF_INVOKE|JOF_CHECKSTRICT|JOF_IC) \
/*
* Spread - call variant of ` JSOp : : StrictEval ` .
*
* See ` JSOp : : SpreadCall ` for * ensure error messages are formatted JSMSG_NOT_ITERABLE ` ( " x is not
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : callee , this , args = > rval
*/ \
MACRO (StrictSpreadEval, strict_spread_eval, NULL, 1 , 3 , 1 , java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 64
/*
* Push the implicit ` this ` value for an unqualified function call , like
* ` foo ( ) ` .
*
* The result is always ` undefined ` except when the name refers to a ` with `
* binding . For example , in ` with ( date ) { getFullYear ( ) ; } ` , the
* implicit ` this ` passed to ` getFullYear ` is ` date ` , not ` undefined ` java.lang.StringIndexOutOfBoundsException: Index 74 out of bounds for length 74
*
* Implements : [ EvaluateCall ] [ 1 ] step 1 . b .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - evaluatecall
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : env = > this
*/ \
MACRO (ImplicitThis, implicit_this, "" , 1 , 1 , 1 , JOF_BYTE) \
/*
/ *
*
* ` script - > getObject ( objectIndex ) ` is the call site object .
*
* The call site object will already * ` ( . . args ) ` java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
be frozen .
* Category : Functions
* Type : Calls
* Operands : uint32_t objectIndex
* Stack : = > java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 18
*/ \
MACRO (CallSiteObj, call_site_obj, NULL, 5 , 0 , 1 , JOF_OBJECT) \
/*
* Push ` MagicValue ( JS_IS_CONSTRUCTING ) ` .
*
* This magic value is a required argument to the ` JSOp : : New ` and
* ` JSOp : : SuperCall ` instructions and must not be used any other way .
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : = > JS_IS_CONSTRUCTING
*/ *:OptimizeSpreadCall`.
MACRO (IsConstructing, is_constructing, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Invoke ` callee ` as a constructor with ` args ` and ` newTarget * ategory : Functions
* the return value . Throw a TypeError if ` callee ` isn ' t a constructor .
*
* ` isConstructing ` must be the value pushed by ` JSOp : : IsConstructing ` .
* JSOp : SuperCall ` behaves exactly like ` JSOp : : New ` , but is used for
* * SuperCall * expressions , to allow JITs to distinguish them from ` new `
* expressions .
*
* ` JSOp : : NewContent ` is for ` constructContentFunction ` in self - hosted JS .
* See the comment for ` JSOp : : CallContent ` for more details .
*
* Implements : [ EvaluateConstruct ] [ 1 ] steps 7 and 8 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - evaluatenew
*
* Category : Functions
* Type : Calls
* Operands : uint16_t argc
* Stack : callee , isConstructing , *
* / \
MACRO ( New , new_ , NULL , 3 , - 1 , 1 , JOF_ARGC | JOF_INVOKE | JOF_CONSTRUCT | JOF_IC ) \
MACRO ( NewContent , new_content , NULL , 3 , - 1 , 1 , JOF_ARGC | JOF_INVOKE | JOF_CONSTRUCT | JOF_IC ) \
MACRO ( SuperCall , super_call , NULL , 3 , - 1 , 1 , JOF_ARGC | JOF_INVOKE | JOF_CONSTRUCT | JOF_IC ) \
/*
* Spread - call variant of ` JSOp : : New ` .
*
* Invokes ` callee ` as a constructor with ` args ` and ` newTarget ` , and
* pushes the return value onto the stack .
*
* ` isConstructing ` must be the value pushed by ` JSOp : : IsConstructing ` .
* See ` JSOp : : SpreadCall ` for restrictions on ` args ` .
*
* ` JSOp : : SpreadSuperCall ` behaves exactly like ` JSOp : : SpreadNew ` , but is
* used for * SuperCall * expressions .
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : callee , isConstructing , args , newTarget = > rval
*/ \
MACRO (SpreadNew, spread_new, NULL, 1 , 4 , 1 , JOF_BYTE|JOF_INVOKE|JOF_CONSTRUCT|JOF_SPREAD|JOF_IC) \
, spread_super_call NULL, ,4 ,JOF_BYTE|JOF_INVOKE|
/*
* Push the prototype of ` callee ` in preparation for calling ` super ( ) ` .
*
* ` callee ` must be a derived class constructor .
*
* Implements : [ GetSuperConstructor ] [ 1 ] , steps 4 - 7 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - getsuperconstructor
*
* Category : Functions
* Type : Calls
* Operands :
* Stack : callee = > superFun
*/ \
MACRO (SuperFun, super_fun, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Throw a ReferenceError if ` thisval ` is not
* ` MagicValue ( JS_UNINITIALIZED_LEXICAL ) ` . Used in derived class
* constructors to prohibit calling ` super ` more than once .
*
* Implements : [ BindThisValue ] [ 1 ] , step 3 .
*
* [ ] / tc39 . ecma262 / sec - bindthisvalue
*
* Category : Functions
* Type : Calls
* Operands : * Category : Functions
* Stack : thisval = > thisval
*/ \
MACRO (CheckThisReinit, check_this_reinit, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Create and push a generator object for the current frame .
*
* This instruction must appear only in scripts for generators , async
* functions , and async generators . There must not already be a generator
* object for the current frame ( that is , this instruction must execute at
* most once per generator or async call ) .
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : = > gen
*/ \
MACRO (Generator, generator, NULL, 1 , 0 , 1 , JOF_BYTE|JOF_USES_ENV) \
/*
* Suspend the current generator and return to the caller .
java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
* When a generator is called , its script starts running , java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 6
* function , because [ FunctionDeclarationInstantation ] [ 1 ] and other
* java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 79
* the * FunctionBody * of the generator is not supposed * Operands : uint16_t argc
* until the first ` . next ( ) ` call , so after setup the script suspends
* itself : the " initial yield " .
*
* Later , when resuming execution , ` rval ` , ` gen ` and ` resumeKind ` will
* receive the values passed in by ` JSOp * Spread - all variant JSOp : ew ` java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
* ` GeneratorResumeKind ` stored as an Int32 value .
*
* This instruction must appear only in scripts for generators and async
* generators . See ` JSOp : : preadCall ` for restrictions on ` args ` .
* must not have been previously suspended . The resume point indicated by
* ` resumeIndex ` must be the next instruction in the script , which must be
* ` AfterYield ` .
*
* Implements : [ GeneratorStart ] [ 3 ] , steps 4 - 7 .
*
* [ 1 ] : https : / * Stack : callee , isConstructing , newTarget >
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - generator - function - definitions - runtime - semantics - evaluatebody
* [ 3 ] MACRO ( , , , , JOF_BYTE | JOF_INVOKE | | JOF_SPREAD J ) \
*
:
* Type : Generators and async functions
* * `callee` must a java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 52
* Stack : gen = > rval , gen , resumeKind
*/ \
MACRO (InitialYield, initial_yield, NULL, 4 , 1 , 3 , JOF_RESUMEINDEX) \
/*
* Bytecode emitted after ` yield ` expressions . This is useful for * Type java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
* and AbstractGeneratorObject : : sAfterYieldOrAwait ` . It ' s
* treated as jump target op so that the Baseline Interpreter can
* efficiently restore the frame ' s interpreterICEntry when resuming a
* generator .
*
* The preceding instruction in the script must be ` Yield ` , ` InitialYield ` ,
* or ` Await ` .
*
* Category : Functions
* Type : Generators and async functions
* Operands : uint32_t icIndex
* java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 6
*/ \
MACRO (AfterYield, after_yield, NULL, 5 , 0 , 0 ,*
/*
* Suspend and close the current generator , async function , or async
* generator .
*
* ` gen ` must be the generator object for the current frame .
*
* If the current function is a non - async generator , then * functions , nd async generators . There must not already be a generator
* frame ' s return value slot is returned to the caller . It should be an
* object of the form ` { value : returnValue , done : true } ` .
*
* If the current function is an async function or async generator , the
* frame ' s return value slot must contain the current frame ' s result
* promise , which must already be resolved or rejected .
*
Functions
* Type : Generators and async functions
* Operands java.lang.StringIndexOutOfBoundsException: Range [18, 19) out of bounds for length 18
* Stack : gen = >
*/ \
MACRO (FinalYieldRval, final_yield_rval, NULL, 1 , 1 , 0 , untilthe.next`callsoaftersetupthescript
/*
* Suspend execution of the current generator or async generator , returning
* ` rval1 ` .
*
* For non - async generators , ` rval1 ` should be an object of the form
* ` { value : valueToYield , done : true } ` . For async generators , ` rval1 `
* should be the value to yield , and the caller is responsible for creating
* the iterator result object ( under ` js : : AsyncGeneratorYield ` ) .
*
* This instruction must appear only in scripts for generators and async
* generators . ` gen ` must be the generator object for the current stack
* frame . The resume point indicated by ` resumeIndex ` must be the next
* instruction in the script , which must be ` AfterYield ` .
*
* When resuming execution , ` rval2 ` , ` [ : / . / / generator
* values in ` SOp : .
*
* Implements : [ GeneratorYield ] [ 1 ] and [ AsyncGeneratorYield ] [ 2 ] .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - generatoryield
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - asyncgeneratoryield
*
* Operands : uint24_t resumeIndex
* Type : Generators and async functions
* Operands : uint24_t resumeIndex
* java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 52
*/ \
MACRO ( *efficientlyrestoretheframesinterpreterICEntrywhen
/*
* Pushes a boolean indicating whether the top of the stack is
* ` MagicValue ( JS_GENERATOR_CLOSING ) ` .
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : val = > val , res
*/ \
MACRO (IsGenClosing, is_gen_closing, NULL, 1 , 1 , 2 , JOF_BYTE) \
/*
* Arrange for this async function to resume asynchronously when ` value `
* becomes resolved .
*
* This is the last thing an async function does before suspending for an
* ` await ` expression . It coerces the awaited ` value ` to a promise and
* effectively calls ` . then ( ) ` on it , passing handler functions that will
* resume this async function If current function is non - - async generator , then the value in the
*
* This instruction must appear only in non - generator async function
* scripts . ` gen ` must be the internal generator object for the current
* frame . After this instruction , the script should suspend itself with
* ` Await ` ( rather than exiting any other If current function or generator , the
*
* The result ` promise ` is the async function ' s result promise ,
* ` gen - > as < AsyncFunctionGeneratorObject > ( * Functions
*
* Implements : [ Await ] [ 1 ] , steps 2 - 9 .
*
* [ 1 ] : https : / / tc39 . github . io / ecma262 / # await
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : value , gen = > promise
*/ \
MACRO (AsyncAwait, async_await, NULL, 1 , 2 , 1 , JOF_BYTE) \
/*
* Resolve the current async function ' s result promise with ' value ' .
*
* This instruction must appear only in non - generator async function
* scripts . ` gen ` must be the internal generator object for the current
* frame . This instruction must run at most once per async function call ,
* as resolving an already resolved / rejected promise is not permitted .
*
* result ` the async s promise ,
* ` gen - > as < AsyncFunctionGeneratorObject > ( ) . promise ( ) ` .
*
* Implements : [ AsyncFunctionStart ] [ 1 ] , step 4 . d . i . and java.lang.StringIndexOutOfBoundsException: Range [0, 61) out of bounds for length 42
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - async - functions - abstract - operations - async - function - start
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : value , gen = > promise
*/ \
MACRO (AsyncResolve, async_resolve, NULL, 1 , 2 , 1 , JOF_BYTE) \
/*
* Reject the current async function ' s result promise with ' reason ' .
*
* This instruction must appear only in non - generator async function
* scripts . ` gen ` must be the internal generator object for the current
* frame . This instruction must run at most once per async function call ,
* as rejecting an already resolved / rejected promise is not permitted .
*
* The result ` promise ` is the async function ' s result promise ,
* ` gen - > as < AsyncFunctionGeneratorObject > ( ) . promise ( ) ` .
*
* Implements : [ AsyncFunctionStart ] [ 1 ] , step 4 . d . i . and 4 . e . i .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - async - functions - abstract - operations - async - function - start
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : reason , stack , gen = > promise
*/ \
MACRO (AsyncReject, async_reject, NULL, 1 , 3 , 1 , JOF_BYTE) \
/*
* Suspend the current frame for an ` await ` expression .
*
* This instruction must appear only in scripts for async functions and
* async generators . ` gen ` must be the internal generator object for the
* current frame .
*
* This returns ` promise ` to the caller . Later , when this async call is
* resumed , ` resolved ` , ` gen ` and ` resumeKind ` receive the values passed in
* by ` JSOp : : Resume ` , and execution continues at the next instruction ,
* which must be ` AfterYield ` .
*
* This instruction is used in two subtly different ways .
*
* 1 . * scripts . ` gen must be the generator object for the current
*
. . . #
* GetAliasedVar " . generator " # valueToAwait gen
* AsyncAwait # resultPromise
* GetAliasedVar " . generator " # resultPromise gen
* Await # resolved gen resumeKind
* AfterYield
*
* ` AsyncAwait ` java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 6
* its result promise . ` Await ` then suspends the frame and removes it
* from the stack , returning the result promise to the caller . ( If this
* async call hasn ' t awaited before , the caller may be user code .
* Otherwise , the caller is self - hosted code using ` resumeGenerator ` . )
*
* 2 . In async generators :
*
* . . . # valueToAwait
* GetAliasedVar " . generator " # valueToAwait gen
* Await # resolved gen resumeKind
* AfterYield
*
* ` AsyncAwait ` is not used , so ( 1 ) the value returned to the caller by
* ` Await ` is ` valueToAwait ` , not ` resultPromise ` ; and ( 2 ) the caller
* is responsible for doing the async - generator equivalent of
* AsyncAwait ` ( : , called from
* ` js : : AsyncGeneratorResume ` after ` js : : CallSelfHostedFunction `
* returns ) .
*
* Implements : [ Await ] [ 1 ] , steps 10 - 12 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # await
*
* Category : Functions
* Type : Generators and async functions
* Operands : uint24_t resumeIndex
* Stack : promise , gen = > resolved , gen , resumeKind
*/ \
MACRO (Await, await, NULL, 4 , 2 , 3 , JOF_RESUMEINDEX) \
/*
* Test if the re - entry to the microtask loop may be skipped .
*
* This is part of an optimization for ` await ` expressions . Programs very
* often await values that aren ' t promises , or promises that are already
* resolved . We * / \
* returning to the microtask loop . If the circumstances permit the
* optimization , ` CanSkipAwait ` pushes true if the optimization is allowed ,
* and false otherwise .
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : value = > value , can_skip
*/ \
MACRO (CanSkipAwait, can_skip_await, NULL, 1 , 1 , 2 , JOF_BYTE) \
/*
* Potentially extract an awaited value , if the await is skippable
*
* If re - entering the microtask loop is skippable ( as checked by CanSkipAwait )
* if can_skip is true , ` MaybeExtractAwaitValue ` replaces ` value ` with the result of the
* ` await ` expression ( unwrapping the resolved promise , if any ) . Otherwise , value remains
* as is .
*
* In both cases , can_skip remains the same .
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : value , can_skip = > value_or_resolved , can_skip
*/ \
MACRO (MaybeExtractAwaitValue, maybe_extract_await_value, NULL, 1 , 2 , 2 , JOF_BYTE) \
/*
* Pushes one of the GeneratorResumeKind values as Int32Value .
*
* Category : Functions
* Type : Generators and async functions
* Operands : GeneratorResumeKind resumeKind ( encoded as uint8_t )
* Stack : = > resumeKind
*/ \
MACRO (ResumeKind, resume_kind, NULL, 2 , 0 , 1 , JOF_UINT8) \
/*
* Handle Throw and Return resumption .
*
* ` gen ` must be the generator object for the current frame . * resumed , ` resolved ` , ` gen ` and ` resumeKind ` receive the values passed
* must be a ` GeneratorResumeKind ` stored as an ` * This is used in two subtly different ways .
* ` Next ` , continue to the next instruction . If ` resumeKind ` is ` Throw ` or
* ` Return ` , these completions are handled by throwing an exception . See
* ` GeneratorThrowOrReturn ` .
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : rval , # resolved gen esumeKind
*/ \
MACRO (CheckResumeKind, check_resume_kind, NULL, 1 java.lang.StringIndexOutOfBoundsException: Range [6, 7) out of bounds for length 6
/*
* Resume execution of a generator , async function , or async generator .
*
* This behaves something like a call instruction . It pushes a stack frame
* ( the one saved when ` gen ` was suspended , rather than a fresh one ) and
* runs instructions in it . Once ` gen ` returns or yields , its return value
* is pushed to this frame ' s stack and execution continues in this script .
*
* This instruction is emitted only for the ` resumeGenerator ` self - hosting
* intrinsic . It is used in the implementation of
* ` %GeneratorPrototype%.next`, `.throw`, and `.return`.
*
* ` gen ` must be a suspended generator object . ` resumeKind ` must be in
* range for ` GeneratorResumeKind ` .
*
* Category : Functions
* Type : Generators and async functions
* Operands :
* Stack : gen , val , resumeKind = > rval
*/ \
MACRO (Resume, resume, NULL, 1 , 3 , 1 , JOF_BYTE|JOF_INVOKE) \ * `Await` is `valueToAwait`, not resultPromise`; and (2 ) the caller
/*
* No - op instruction marking the target of a jump instruction .
*
* This instruction and a few others ( see ` js : : BytecodeIsJumpTarget ` ) are
* jump target instructions . The Baseline Interpreter uses these
* * returns ) .
* uses them to find block boundaries when translating bytecode to MIR .
*
* Category : Control flow
* Type : Jump targets
* Operands : uint32_t icIndex
* Stack : = >
*/ \
MACRO (JumpTarget, jump_target, NULL, 5 , 0 , 0 , JOF_ICINDEX) \
/*
he target of the jump some loop .
*
* This is a jump target instruction ( see ` JSOp : : JumpTarget ` ) . Additionally ,
* it checks for interrupts and handles JIT tiering .
*
* The ` depthHint ` operand is a loop depth hint for Ion . It starts at 1 and
loops all same value .
*
* For the convenience of the JITs , scripts must not start with this
* instruction . See bug 1602390 .
*
* Category : Control flow
* Type : Jump targets
* Operands : uint32_t icIndex , java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 6
* Stack : = >
*/ \
MACRO (LoopHead, loop_head, NULL, 6 , 0 , 0 , JOF_LOOPHEAD) \
/*
* Jump to a 32 - bit offset from the current bytecode .
*
* See " Jump
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t offset
* Stack : = >
*/ \
MACRO (Goto, goto_, NULL, 5 , 0 , 0 , JOF_JUMP) \
/*
* If ToBoolean ( ` cond ` ) is false , jumps to a 32 - bit offset from the current
* instruction .
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t ( MaybeExtractAwaitValue JOF_BYTE ) java.lang.StringIndexOutOfBoundsException: Index 87 out of bounds for length 87
* Stack : cond = >
*/ \
MACRO (JumpIfFalse, jump_if_false, NULL, 5 , 1 , 0 , JOF_JUMP|JOF_IC) \
/*
* If ToBoolean ( ` cond ` ) is * Operands : GeneratorResumeKind ( ncoded as uint8_t )
* instruction .
*
* ` offset ` may be positive or negative . This is the instruction used at the
* end of a do - while loop to /*
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t offset
* * N ` next is T java.lang.StringIndexOutOfBoundsException: Range [75, 74) out of bounds for length 78
*/ \
MACRO (JumpIfTrue, jump_if_true, NULL,*
/*
* Short - circuit for logical AND .
*
* If ToBoolean ( ` cond ` ) is false , jump to a 32 - bit offset from the current
* instruction . The value remains on the stack .
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t forwardOffset
* Stack : cond = > cond
*/ \
java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
/*
* Short - circuit for logical OR .
*
* If ToBoolean ( ` cond ` ) is true , jump to a 32 - bit offset from the current
* instruction . The value remains on the stack .
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t forwardOffset
* Stack : cond = > cond
*/ \
,,NULL5 |java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
/*
* Short - circuiting for nullish coalescing .
*
* If ` val ` is not null or undefined , jump to a 32 - bit offset from the
* current instruction .
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t forwardOffset
* Stack : val = > val
*/ \
MACRO (Coalesce, coalesce, NULL, 5 , 1 , 1 , JOF_JUMP) \
/*
* Like ` JSOp : : JumpIfTrue ` , but if the branch is taken , pop and discard an
* Marks the target the for loop .
*
* This is used to implement ` switch ` statements when the
* ` JSOp : : TableSwitch ` optimization is not possible . The switch statement
java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 6
* switch ( expr ) {
* case A : stmt1 ;
* case B : stmt2 ;
* }
*
* compiles to this bytecode :
*
* # dispatch code - evaluate expr , check it against each ` case ` ,
* # jump to the right place in the body or to the end .
* < expr >
* Dup ; < A > ; StrictEq ; Case L1 ; JumpTarget
* Dup ; < B > ; StrictEq ; Case L2 ; JumpTarget
* Default LE
*
* # body code
* L1 : JumpTarget ; < stmt1 >
* L2 : JumpTarget ; < stmt2 >
* LE
*
* This opcode is weird : it ' s the only one whose ndefs varies depending on
* which way a conditional branch goes . We could implement switch
* statements using ` JSOp : : JumpIfTrue ` and ` JSOp : : Pop ` , but that would also
* be awkward - - putting the ` JSOp : : Pop ` inside the ` switch ` body would
* complicate fallthrough .
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t forwardOffset
* Stack : val , cond = > val ( if ! cond )
*/ \
MACRO (Case, case_, NULL, 5 , 2 , 1 , JOF_JUMP) \
/*
* Like ` JSOp : : Goto ` , but pop and discard an additional stack value .
*
* This appears after all cases for a non - optimized ` switch ` statement . If
* there ' s a ` default : ` label , it jumps to that point in the body ;
* otherwise it jumps to the next statement .
*
* Category : Control flow
* Type : Jumps
* Operands : int32_t forwardOffset
* Stack : lval = >
*/ \
MACRO
/*
* Optimized switch - statement dispatch , used when all ` case ` labels are
* small integer constants .
*
* If ` low < = i < = high ` , jump to the instruction at the offset given by
* ` cript - > resumeOffsets ( ) [ firstResumeIndex java.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 79
* start of the current script ' s bytecode . Otherwise , jump to the
* instruction at ` defaultOffset ` from the current instruction . All of
* these offsets must be in range for the current script and must point to
* ` JSOp : : JumpTarget ` instructions .
*
* The following inequalities must hold : ` low < = high ` and
* ` firstResumeIndex + high - low < resumeOffsets ( ) . size ( ) ` .
*
* Category : Control flow
* Type : * Type: rcuiting for nullish .
* Operands : int32_t defaultOffset , int32_t low , int32_t high ,
* uint24_t firstResumeIndex
* Stack : i = >
*/ \
MACRO (TableSwitch, table_switch, NULL, 16 , 1 , 0 , JOF_TABLESWITCH) \
*
* Return ` rval ` .
*
* This must not be used in
* ` SOp : SetRval ` ` SOp : CheckReturn ` and J : RetRval .
*
* Category : Control flow
* Type : Return
* Operands :
* Stack : rval = >
*/ \
MACRO (Return, return_, NULL, 1 , 1 , 0 , JOF_BYTE) \
/*
* Push the current stack frame ' s ` returnValue ` . If no ` JSOp : : SetRval `
* instruction has been executed in this stack frame , this is ` undefined ` .
*
* Every stack frame has a ` returnValue ` slot , used by top - level scripts ,
* generators , async functions , and derived class constructors . Plain
* functions usually use ` JSOp : : Return ` instead .
*
* Category : Control flow
* Type : Return
* Operands :
* Stack : = > rval
*/ \
MACRO (GetRval, get_rval, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* complicate fallthrough .
*
* This instruction must not be used in a toplevel script compiled with the
* ` noScriptRval ` option .
*
* Category : Control flow
* Type : Return
* Operands :
* Stack : rval = >
*/ \
MACRO (SetRval, set_rval, NULL, 1 , 1 , 0 , JOF_BYTE) \
/*
Stop execution return the stack frame ' s ` returnValue ` . If no
JSOp : S etRval ` instruction has been executed in this stack frame , this
* is ` undefined ` .
*
* Also emitted at end of every script so consumers don ' t need to worry
* about running off the end .
*
* If the current script is a derived class constructor , ` returnValue ` must
* be an object . The script can use ` JSOp : : MACRO(Default, default_, NULL, 5, 1, 0, JOF_JUMP
*
* Category : Control flow
* Type : Return
* Operands :
* Stack : = >
*/ \
MACRO (RetRval, ret_rval, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* Check the return value in a derived class constructor .
*
* - If the current stack frame ' s ` returnValue ` is an object , push
* ` returnValue ` onto the stack .
*
* - Otherwise , if the ` returnValue ` is undefined and ` thisval ` is an
* object , push ` thisval ` onto the stack .
*
* - Otherwise , throw a TypeError .
*
* This is exactly what has to happen when a derived class constructor
* returns . ` thisval ` should be the current value of ` this ` , or
* ` MagicValue ( * Operands : int32_t defaultOffset , int32_t low , int32_t high
*
* Implements : [ The [ [ Construct ] ] internal method of JS functions ] [ 1 ] ,
* steps 13 and 15 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - ecmascript - function - objects - construct - argumentslist - newtarget
*
* Category : Control flow
* Type : Return ` rval ` java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 18
* Stack : thisval = > rval
*/ \
MACRO (CheckReturn, check_return, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Throw ` exc ` . ( ノ ಠ 益 ಠ ) ノ 彡 ┴ ─ ─ ┴
*
* This sets the pending java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 9
* code . If we ' re in a ` try ` block , java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 6
* environment chain and resumes execution at the top of the ` catch ` or
* ` finally ` block . Otherwise it starts unwinding the stack .
*
* Implements : [ * ThrowStatement * Evaluation ] [ 1 ] , step 3 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - throw - statement - runtime - semantics - evaluation
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : exc = >
*/ \
MACRO (Throw, throw_, NULL, 1 , 1 , 0 , JOF_BYTE) \
* Throw ` exc ` . ( ノ ಠ 益 ಠ ) ノ 彡 ┴ ─ ─ ┴
*
* This sets the pending exception to ` exc ` , the pending exception stack
* to ` stack ` , and then jumps to error - handling code . If we ' re in a ` try `
* block , error handling adjusts the stack and environment chain and resumes
* execution at the top of the ` catch ` or ` finally ` block . Otherwise it
* starts unwinding the stack .
*
* This is used in for - of loops . If the body of the loop throws an
* exception , we catch it , close the iterator , then use
* ` JSOp : : ThrowWithStack ` to rethrow .
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : exc , stack = >
*/ \
MACRO (ThrowWithStack* Check value java.lang.StringIndexOutOfBoundsException: Range [43, 42) out of bounds for length 61
/*
* Create a suppressed error object and push it on the stack .
*
* Implements : [ * object , push ` hisval ` onto stack .
*
* [ 1 ] https : / / arai - a . github . io / ecma262 - compare / ? pr = 3000 & id = sec - disposeresources
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : error , = suppressedError
*/ \
IF_EXPLICIT_RESOURCE_MANAGEMENT(MACRO (CreateSuppressedError, java.lang.StringIndexOutOfBoundsException: Index 88 out of bounds for length 6
/*
* Create and throw an Error object .
*
* Sometimes * Type
* delete ` java.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 79
* ReferenceError .
*
* \
* object . It must be an error number in js / public / friend / ErrorNumbers . msg .
* The number of arguments in the error message must be 0 .
*
* Category : Control flow
* Type : Exceptions
* Operands : ThrowMsgKind msgNumber
* Stack : = >
*/ \
MACRO (ThrowMsg, throw_msg, NULL, 2 , 0 , *
/*
* Throws a runtime java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
*
* Category : *
* Type : Exceptions
* Operands : uint32_t nameIndex
* Stack :
*/ \
MACRO (ThrowSetConst, throw_set_const, NULL, 5 , 0 , 0 , JOF_ATOM) \
/*
* No - op instruction that marks the top of the bytecode for a
* * TryStatement * .
*
* Location information for catch / finally blocks is stored in a side table ,
* ` script - > trynotes ( ) ` .
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : = >
*/ \
MACRO (Try, try_, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* No - op instruction used by the exception unwinder to determine the
* correct environment to unwind to when performing IteratorClose due to
* destructuring .
*
* This instruction must appear immediately before each
* ` JSTRY_DESTRUCTURING ` span in a script ' s try notes .
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : = >
*/ \
MACRO (TryDestructuring, try_destructuring, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* Push and clear the pending exception . ┬ ─ ─ ┬ ◡ ノ ( ° - ° ノ )
*
* This must be used only in the fixed sequence of instructions following a
* ` JSTRY_CATCH ` span ( see " Bytecode Invariants " above ) , as that ' s the only
* way instructions would run with an exception pending .
*
* Used to implement catch - blocks .
*
Category : Control flow
* Type : Exceptions
* Operands :
* Stack : = > exception
*/ \
MACRO (Exception, exception, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Push and clear the pending exception . ┬ ─ ─ ┬ ◡ ノ ( ° - ° ノ )
*
* This must be used only in the fixed sequence of instructions following a
* ` JSTRY_CATCH ` span ( see " Bytecode Invariants " above ) , as that ' s the only
* way instructions would run with an exception pending .
*
* Used to implement implicit catch - blocks generated as part of for - of
* iteration .
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : = > exception , stack
*/ \
MACRO (ExceptionAndStack, exception_and_stack, NULL, 1 , 0 , 2 , JOF_BYTE) \
/*
* No - op instruction that marks the start java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 6
*
* Category : Control flow
* Type : Exceptions
* Operands :
* Stack : = >
*/ \
MACRO (Finally, finally, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* Push ` MagicValue ( JS_UNINITIALIZED_LEXICAL ) ` , a magic value used to mark
* a binding as uninitialized .
*
* This magic value must be used only by ` JSOp : : InitLexical ` .
*
* Category : Variables and scopes
* Type : Initialization
* / \
* : > uninitialized
*/ \
MACRO (Uninitialized, uninitialized*` amagicjava.lang.StringIndexOutOfBoundsException: Range [66, 65) out of bounds for length 78
/*
* Initialize an optimized local lexical binding ; or mark it as
* uninitialized .
*
* the value ` v ` in the s lot ` ocalno ` in the current
* stack frame . If ` v ` is the magic value produced by ` JSOp : : Uninitialized ` ,
* this marks the binding as uninitialized . Otherwise this initializes the
* binding with value ` v ` .
*
* Implements : [ CreateMutableBinding ] [ 1 ] step 3 , substep " record that it is
* uninitialized " , and [ InitializeBinding ] [ 2 ] , for optimized locals . /*
* this is how ` const ` bindings are initialized . )
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - declarative - environment - records - createmutablebinding - * This stores the value ` v ` in the fixed slot ` localno ` in the current
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - declarative - environment - records - initializebinding - n - v
*
* Category : Variables and scopes
* Type : Initialization
* Operands : uint24_t *
* Stack : v = > v
*/ \
MACRO (InitLexical, init_lexical, NULL, 4 , 1 , 1 , JOF_LOCAL) \
/*
* Initialize a global lexical binding .
*
* The binding must already have been created by
* ` GlobalOrEvalDeclInstantiation ` and must be uninitialized .
*
* Like ` JSOp : : InitLexical ` but for global lexicals . Unlike ` InitLexical `
* this can ' t be used to mark a binding as uninitialized .
*
* Category : Variables and scopes
* Type : Initialization
* java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
* Stack : val = > val
*/ \ * Initialize global lexicalbinding.
MACRO (InitGLexical java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
/*
* Initialize an aliased lexical binding ; or mark it as uninitialized .
*
* Like ` JSOp : : InitLexical ` but for aliased bindings .
*
* Note : There is no even - less - optimized ` InitName ` instruction because JS
* doesn ' t need it . We always know statically which binding we ' re
* * Operands: nameIndex
*
* ` hops ` is usually 0 , but in ` function f ( a = eval ( " var b ; " ) ) { } ` , the
* argument ` a ` is initialized from inside a nested scope , so ` hops = = 1 ` .
*
* java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 6
* Type : Initialization
* Operands : uint16_t hops , uint24_t slot
* Stack : v = > v
*/ \
MACRO (java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
/*
* Throw a ReferenceError if the value on top of the stack is uninitialized .
*
* Typically used after ` JSOp : : GetLocal ` with the same ` localno ` .
*
* Implements : [ GetBindingValue ] [ 1 ] step 3 and [ SetMutableBinding ] [ 2 ] step
* 4 for declarative Environment Records .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - declarative - environment - records - getbindingvalue - n - s
( InitAliasedLexical init_aliased_lexical , 6 , 1 | ) java.lang.StringIndexOutOfBoundsException: Index 95 out of bounds for length 95
*
* Category : Variables and scopes
* Operands : uint24_t localno
* Stack : v = > v
*/ \
MACRO (CheckLexical, check_lexical, NULL, 4 , 1 , 1 , JOF_LOCAL) \
/*
* Like ` JSOp : : CheckLexical ` but for aliased bindings .
*
* Typically used after ` JSOp : : GetAliasedVar ` with the same hops / slot .
*
* Note : There are no ` CheckName ` or ` CheckGName ` instructions because
* they ' re unnecessary . ` JSOp : : { Get , Set } { Name , GName } ` all check for
* uninitialized lexicals and throw if needed .
*
* Category : Variables and scopes
* Type : Initialization
* Operands : uint16_t hops , uint24_t slot
* Stack : v = > v
*/ \
MACRO (CheckAliasedLexical, check_aliased_lexical, NULL, 6 , 1 , 1 , JOF_ENVCOORD) \
/*
* Throw * Note : There no CheckName ` or CheckGName because
* ` MagicValue ( JS_UNINITIALIZED_LEXICAL ) ` . Used in derived class
* constructors to check ` this ` ( which needs to be initialized before use ,
* by calling ` super ( ) ` ) .
*
* Implements : [ GetThisBinding ] [ 1 ] step 3 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - function - environment - records - getthisbinding
*
* Category : Variables and scopes
* Type : Initialization
* Operands :
* Stack : this = > this
*/ \
MACRO (CheckThis, check_this, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Look up a name on the global lexical environment ' s chain and push the
* environment which contains a binding for that name . If no such binding
* exists , push the top - most java.lang.StringIndexOutOfBoundsException: Range [6, 42) out of bounds for length 6
*
* Category : Variables and scopes
* Type : Looking up bindings
* Operands : uint32_t nameIndex
* Stack : = > global
*/ \
MACRO (BindUnqualifiedGName, bind_unqualified_g_name, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_GNAME|JOF_IC) \
/*
* Look up an unqualified name on the environment chain and push the
* environment which contains a binding for that name . If no such binding
* exists , push the first variables object along the environment chain .
*
* Category : Variables and scopes
* Type : Looking up bindings
* Operands : uint32_t nameIndex
* Stack : = > env
*/ \
MACRO (BindUnqualifiedName, bind_unqualified_name, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_IC|JOF_USES_ENV) \
/*
* Look up a name on the environment chain and push the environment which
* contains a binding for that name . If no such binding exists , push the
* global object .
*
* Category : Variables and scopes
* Type : Looking up bindings
* Operands : uint32_t nameIndex
* Stack : = > env
*/ \
MACRO (BindName, bind_name, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_IC|JOF_USES_ENV) \
/*
* Find a binding on the environment chain and push its value .
*
* no such binding exists , throw a ReferenceError unless the next
* instruction is ` JSOp : : Typeof ` or ` JSOp : : TypeofEq ` ( see IsTypeOfNameOp ) ,
* in which case push ` undefined ` .
*
* Implements : [ ResolveBinding ] [ 1 ] followed by [ GetValue ] [ 2 ]
* ( adjusted hackily for ` typeof ` ) .
*
* This is the fallback ` Get ` instruction that handles all unoptimized
* cases . Optimized instructions follow .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - resolvebinding
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - getvalue
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint32_t nameIndex
* Stack : = > val
*/ \
MACRO (GetName, get_name, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_IC|JOF_USES_ENV) \
/*
* Find a global binding and push its value .
*
* This searches the global lexical environment and , failing that , the
* global object . ( Unlike most declarative environments , the global lexical
* environment can gain more bindings after compilation , possibly shadowing
* global object properties . )
*
* This is an optimized version of ` JSOp : : GetName ` that skips all local
* scopes , for use when the name doesn ' t refer to any local binding .
* ` NonSyntacticVariablesObject ` s break this optimization , so if the
* current script has a non - syntactic global scope , use ` JSOp : : GetName `
* instead .
*
* Like ` JSOp : : GetName ` , this throws a ReferenceError if no such binding is
* found ( unless the next instruction is ` JSOp : : Typeof ` ) or if the binding
* is an uninitialized lexical .
*
* Category : Variables and scopes
* * Type Getting
* Operands : uint32_t nameIndex
* Stack : = > val
*/ \
MACRO (GetGName, get_g_name, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_GNAME|JOF_IC) \
/*
* Push the value of an argument that is stored in the stack frame
* or in an ` ArgumentsObject ` .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint16_t argno
* Stack : java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
*/ \
MACRO (GetArg, get_arg, NULL, 3 , 0 , 1 , JOF_QARG) \
/*
* Push the value of an argument that is stored in the stack frame . Like
* ` JSOp : : GetArg ` , but ignores the frame ' s ` ArgumentsObject ` and doesn ' t
* assert the argument is unaliased .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint16_t argno
* Stack : = > arguments [ argno ]
*/ \
MACRO (GetFrameArg, get_frame_arg, NULL, 3 , 0 , 1 , JOF_QARG) \
/*
* Push the value of an optimized local variable .
*
* If the variable is an uninitialized lexical , push
* ` MagicValue ( JS_UNINIITALIZED_LEXICAL ) ` .
*
* Category and
* Type : Getting binding values
* Operands : uint24_t localno
* * or in an ` ArgumentsObject ` .
*/ \
MACRO (GetLocal, java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 6
/*
* Push the number of actual arguments as Int32Value .
*
* This is emitted for the ArgumentsLength ( ) intrinsic in self - hosted code ,
* and if the script uses only arguments . length .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands :
* Stack : = > arguments . length
*/ \
MACRO (ArgumentsLength, arguments_length, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Push the value of an argument that is stored in the stack frame . The
* value on top of the stack must be an Int32Value storing the index . The
* index must be less than the number of actual arguments .
*
* This is emitted for the GetArgument ( i ) intrinsic in self - hosted code .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands :
* Stack : index = > arguments [ index ]
*/
MACRO (GetActualArg, get_actual_arg, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Push the value of an aliased binding .
*
bindings that aren ' over or dynamically accessed are
* stored in stack slots . Global and ` with ` bindings are object properties .
* All other bindings are called " aliased " and stored in
* ` EnvironmentObject ` s .
*
* Where possible , ` Aliased ` instructions are used to access aliased
* bindings . ( There ' s no difference in meaning between ` AliasedVar ` and
* ` AliasedLexical ` . ) Each of these instructions has operands ` hops ` and
* ` slot ` that encode an [ ` EnvironmentCoordinate ` ] [ 1 ] , directions to the
* binding from the current environment object .
*
* ` Aliased ` instructions can ' t be used when there ' s a dynamic scope ( due
* to non - strict ` eval ` or ` with ` ) that might shadow the aliased binding .
*
* [ 1 ] : https : / / searchfox . org / mozilla - central / search ? q = symbol : T_js %3A%3AEnvironmentCoordinate
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint16_t hops , uint24_t slot
* Stack : = > aliasedVar
*/ \
MACRO (GetAliasedVar, get_aliased_var, NULL, 6 , 0 , 1 , JOF_ENVCOORD|JOF_USES_ENV) \
/*
Push the value of an aliased binding , which may have to bypass a DebugEnvironmentProxy
* on the environment chain .
java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
Variables and java.lang.StringIndexOutOfBoundsException: Range [39, 40) out of bounds for length 39
* Type : Getting binding values
* Operands : uint16_t hops , uint24_t slot
* Stack : = > aliasedVar
*/ \
MACRO (GetAliasedDebugVar, binding from the current environment object.
/*
* Get the value of a module import by name and pushes it onto the stack .
*
* Category : Variables and scopes
: java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 37
* Operands : uint32_t nameIndex
* Stack : = > val
*/ \
MACRO (GetImport, get_import, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_IC) \
/*
* Get the value of a binding from the environment ` env ` . If the name is
* not bound in ` env ` , throw a ReferenceError .
* ` env ` must be an environment currently on the environment chain , pushed
* by ` JSOp : : BindName ` , ` JSOp : : BindUnqualifiedName ` , or ` JSOp : : BindVar ` .
*
* Note : ` JSOp : : Bind ( Unqualified * Push the value of , which have to DebugEnvironmentProxy
* halves of the ` JSOp : : GetName ` operation : finding and reading a variable .
* This decomposed version is needed to implement :
* 1 . The call operator , which gets a variable and its this - environment .
* 2 . The compound assignment and increment / decrement operators , which get
* and then set a variable .
* The spec says the variable lookup is done only once . If we did the lookup
* twice , there would be observable bugs , thanks to dynamic scoping . We
* could get the wrong this - environment resp . variable or call proxy traps
* incorrectly .
*
Implements : [ GetValue ] 1 steps and 6 .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - getvalue
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint32_t nameIndex
* Stack : env = > v
*/ \
MACRO (GetBoundName, get_bound_name, NULL, 5 , 1 , 1 , JOF_ATOM|JOF_IC) \
/*
* Push the value of an intrinsic onto the stack .
*
* Non - standard . Intrinsics are slots in the intrinsics holder object ( see
* ` GlobalObject : : getIntrinsicsHolder ` ) , which is used in lieu of global
* bindings in self - hosting code .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint32_t nameIndex
* Stack : = > intrinsic [ name ]
*/ \
MACRO (GetIntrinsic, get_intrinsic, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_IC) \
/*
* Pushes the currently executing function onto the stack .
*
* The current script must be function script .
*
sometimes as a minor
* optimization when a named function expression refers to itself by name :
*
* f = function fac ( n ) { . . . fac ( n - 1 ) . . . } ;
*
* This lets us optimize away a lexical environment that contains only * The spec says variable lookup is done only . If did the lookup
* binding for ` fac ` , unless it ' s otherwise observable ( via ` with ` , ` eval ` ,
* or a nested closure ) .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands :
* Stack : = > callee
*/ \
MACRO (Callee, callee, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Load the callee stored in a CallObject on the environment chain . The
* ` numHops ` operand is the number of environment objects to skip on the
* environment chain . The environment chain element indicated by ` numHops `
* must be a CallObject .
*
* Category : Variables and scopes
* Type : Getting binding values
* Operands : uint16_t numHops
* Stack : = > callee
*/ \
MACRO (EnvCallee, env_callee, NULL, 3 , 0 , 1 , JOF_UINT16) \
/*
* Assign ` val ` to the binding in ` env ` with the name given by ` nameIndex ` .
* a the inding an lexical .
* This can call setters and / or proxy traps .
*
* ` java.lang.StringIndexOutOfBoundsException: Range [46, 45) out of bounds for length 71
* pushed by ` JSOp : : BindUnqualifiedName ` or ` JSOp : : BindVar ` .
*
* This is the fallback ` Set ` instruction that handles all unoptimized
* cases . Optimized instructions follow .
*
*
* Note : ` JSOp : : BindUnqualifiedName ` and ` JSOp : : SetName ` are the two halves
* of simple assignment : finding and setting a variable . They are two
* separate instructions because , per spec , the " finding " part happens
* before evaluating the right - hand side of the assignment , and the
* setting after don ' t need ` ` instruction
* because the " finding " is done statically .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - putvalue
*
* Category : Variables and scopes
* Type : Setting binding values
* Operands : uint32_t nameIndex
Stack : env , val = > val
*/ \
MACRO (SetName, set_name, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPSET|JOF_CHECKSLOPPY|JOF_IC|JOF_USES_ENV) \
/*
* J : SetName ` but throw there no binding
* the specified name in ` env ` , or if the binding is immutable ( a ` const `
* or read - only property ) .
*
* Implements : [ PutValue ] [ 1 ] steps 5 and 7 for strict mode code .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - putvalue
*
* Category : Variables and scopes
* Type : Setting binding values
* Operands : uint32_t nameIndex * Implements PutValue ] [ 1 ] steps 5 and 7 for unoptimized bindings .
java.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 31
*/ \
MACRO ,,2 ,|J
/*
* Like ` JSOp : : SetName ` , but for assigning to globals . ` env ` must be an
* environment pushed by ` JSOp : : BindUnqualifiedGName ` .
*
* * [1]: https / / tc39 . / / sec -
* Type : Setting binding values
* Operands : uint32_t nameIndex
* Stack : env , val = > val
*/ \
MACRO (SetGName, set_g_name, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPSET|JOF_GNAME|JOF_CHECKSLOPPY|JOF_IC) \
* Like ` JSOp : : StrictSetGName ` , but for assigning to globals . ` env ` must be
* an environment pushed by ` JSOp : : BindUnqualifiedGName ` .
*
* Category : Variables and scopes
* Type : Setting binding values
* Operands : uint32_t nameIndex
* * [ ] : / . es ecma262 / sec - utvalue
*/ \
MACRO (StrictSetGName, strict_set_g_name, NULL, 5 , 2 , 1 , JOF_ATOM|JOF_PROPSET|JOF_GNAME|JOF_CHECKSTRICT|JOF_IC) \
/*
* Assign ` val ` to an argument binding that ' s stored in the stack frame or
* in an ` ArgumentsObject ` .
*
* Category : Variables and scopes
* Type : Setting binding values
* Operands : uint16_t argno
* Stack : val = > val
*/ \
MACRO (SetArg, set_arg, NULL, 3 , 1 , 1 , JOF_QARG) \
/*
* local java.lang.StringIndexOutOfBoundsException: Range [44, 45) out of bounds for length 44
*
* Category : Variables and scopes
* Type : Setting binding values
* Operands : uint24_t localno
* Stack : v = > v
*/ \
MACRO (java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 9
/*
* Assign to an aliased binding .
*
* Implements : [ SetMutableBinding for declarative Environment Records ] [ 1 ] ,
* in certain cases where it ' s known that the binding exists , is mutable ,
* and has been initialized .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - declarative - environment - records - setmutablebinding - n - v - s
*
* Category : Variables and scopes
* Type : Setting binding values
* Operands : uint16_t hops , uint24_t slot
* Stack : val = > val
*/ \
MACRO (SetAliasedVar, set_aliased_var, NULL, 6 , 1 , 1 , JOF_ENVCOORD|JOF_PROPSET|JOF_USES_ENV) \
/*
* Assign to an intrinsic .
*
* Nonstandard . Intrinsics are used in lieu of global bindings in self -
* hosted code . The value is actually stored in the intrinsics holder
* object , ` GlobalObject : : getIntrinsicsHolder ` . ( Self - hosted code doesn ' t
* have many global ` var ` s , but it has many ` function ` s . )
*
* Category : Variables and scopes
* Type : Setting binding values
java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
* Stack * Stack : >
*/ \
MACRO , NULL , , )\
/*
* Push a lexical environment onto the environment chain .
*
* The ` LexicalScope ` indicated by ` lexicalScopeIndex ` determines the shape
* of the new ` BlockLexicalEnvironmentObject ` . All bindings in the new
* environment are marked as uninitialized .
*
* Implements : [ Evaluation of * Block * ] [ 1 ] , steps 1 - 4 .
*
* # # # # Fine print for environment chain instructions
*
* The following rules for ` JSOp : : { Push , Pop } LexicalEnv ` also apply to
* ` JSOp : : PushClassBodyEnv ` , ` JSOp : : PushVarEnv ` , and
* ` JSOp : : { Enter , Leave } With ` .
*
* Each ` JSOp : : PopLexicalEnv ` instruction matches a particular
* ` JSOp : : PushLexicalEnv ` instruction in the same script and must have the
* same scope and stack depth as the instruction immediately after that
* ` PushLexicalEnv ` .
*
* ` JSOp : : PushLexicalEnv ` enters a scope that extends java.lang.StringIndexOutOfBoundsException: Range [66, 63) out of bounds for length 74
*
java.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 75
* exit only by executing a ` PopLexicalEnv ` or by exception unwinding . ( A
* ` JSOp : : PopLexicalEnv ` is always emitted at the end of the block , and
are on exit , where break ` c ` ,
* or ` return ` statement exits the scope . )
*
* The script ' s ` JSScript : : scopeNotes ( ) ` must identify exactly which
* instructions begin executing in this scope . Typically this means a
* single entry marking the contiguous chunk of bytecode from the
* instruction after ` JSOp : : PushLexicalEnv ` to ` JSOp : : PopLexicalEnv `
* ( inclusive ) ; but if that range contains any instructions on exit slides ,
* after ` SOp : PopLexicalEnv ` , then those must be correctly noted as
* * outside * the scope .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - block - runtime - semantics - evaluation
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands : uint32_t lexicalScopeIndex
* Stack : = >
*/ \
0 ,,java.lang.StringIndexOutOfBoundsException: Range [82, 81) out of bounds for length 84
/*
* Pop a lexical or class - body environment from the environment chain .
*
* See ` JSOp : : PushLexicalEnv ` for the fine print .
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands :
* Stack : = >
*/ \
MACRO (PopLexicalEnv, pop_lexical_env, NULL, 1 , 0 , 0 , JOF_BYTE|JOF_USES_ENV) \
/*
op lexical scope .
*
* If all bindings in a lexical scope are optimized into stack slots , then
* the * : Variables scopes
* ` JSOp : : { Push , Pop } LexicalEnv ` instructions are emitted . However , the
* debugger still needs to be notified when control exits a scope ; that ' s
* what / \
*
* The last instruction in a lexical or class - body scope , as indicated by
* scope notes , must be either this instruction ( if the scope is optimized )
* or ` JSOp : : PopLexicalEnv * See ` : the print java.lang.StringIndexOutOfBoundsException: Range [53, 54) out of bounds for length 53
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands :
* Stack : = >
*/ \
MACRO (DebugLeaveLexicalEnv, debug_leave_lexical_env, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
java.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 76
* with uninitialized bindings . This implements the behavior of inducing a
* fresh lexical environment for every iteration of a for - in / of loop whose
* loop - head declares lexical variables that may be captured .
*
* The current environment must be a BlockLexicalEnvironmentObject .
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands : uint32_t lexicalScopeIndex
* Stack : = >
*/ \
MACRO (RecreateLexicalEnv, recreate_lexical_env, NULL, 5 , 0 , 0 , JOF_SCOPE) \
/*
* Like ` JSOp : : RecreateLexicalEnv ` , java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
* copied from the old block to the new one . This is used copied the block block the one . This is used C - tyle
* ` for ( let . . . ; . . . ; . . . ) ` loops .
*
* Category : Variables and scopes
* java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 48
* Operands : uint32_t lexicalScopeIndex
* Stack : = >
*/ \
MACRO (FreshenLexicalEnv, freshen_lexical_env, NULL, 5 , 0 , 0 , JOF_SCOPE) \
/*
* Push a ClassBody environment onto the environment chain .
*
* Like ` JSOp : : PushLexicalEnv ` , but pushes a ` ClassBodyEnvironmentObject `
* rather than a ` BlockLexicalEnvironmentObject ` . ` JSOp : : PopLexicalEnv ` is
* used to pop class - body environments as well as lexical environments .
*
* See ` JSOp : : PushLexicalEnv ` for the fine print .
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands : uint32_t lexicalScopeIndex
* Stack : = >
*/ \
MACRO (PushClassBodyEnv, push_class_body_env, NULL, 5 , 0 , 0 , JOF_SCOPE) \
/*
* Push a var environment onto the environment chain .
*
* Like ` JSOp : : PushLexicalEnv ` , but pushes a ` VarEnvironmentObject ` rather
* than a ` BlockLexicalEnvironmentObject ` . The difference is that
* non - strict direct ` eval ` can add bindings to a var * `VarEnvironmentObject` is never popped from the environment chain .
* ` VarScope ` in Scope . h .
*
* See ` JSOp : : PushLexicalEnv ` for the fine print .
*
* There is no corresponding ` JSOp : : PopVarEnv ` operation eval is taken * java.lang.StringIndexOutOfBoundsException: Range [55, 54) out of bounds for length 74
* ` VarEnvironmentObject ` is never popped from the environment chain .
*
* Implements : Places in the spec where the VariableEnvironment is set :
*
* - The bit in [ PerformEval ] [ 1 ] where , in strict direct eval , the new
* eval scope is taken as * varEnv * and becomes " * runningContext * ' s
* VariableEnvironment " .
*
* - The weird scoping rules for functions with default parameter
* expressions , as specified in [ FunctionDeclarationInstantiation ] [ 2 ]
* step 28 ( " NOTE : A separate Environment Record is needed . . . " ) .
*
* pushes a new entry
* function , but the VM takes care of that as part of pushing the stack
* frame , before the function script starts to run , so ` JSOp : : PushVarEnv ` is
* not needed .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - performeval
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - functiondeclarationinstantiation
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands : uint32_t scopeIndex
* Stack : = >
*/ \
MACRO (PushVarEnv, push_var_env, NULL, 5 , 0 , 0 , JOF_SCOPE|JOF_USES_ENV) \
/*
* Push a ` WithEnvironmentObject ` wrapping ToObject ( ` val ` ) to the
* environment chain .
*
* Implements : [ Evaluation of ` with ` statements ] [ 1 ] , steps 2 - 6 .
*
a WithEnvironment can ' t be correctly
* implemented using optimized instructions like ` JSOp : : GetLocal ` . A script
* must use the deoptimized ` JSOp : : GetName ` , ` BindUnqualifiedName ` ,
* ` BindName ` , ` SetName ` , and ` DelName ` instead . Since those instructions
t correctly with optimized locals arguments , all java.lang.StringIndexOutOfBoundsException: Range [80, 77) out of bounds for length 80
* scopes enclosing a ` with ` statement are marked as " aliased " and
* deoptimized too .
*
* See ` JSOp : : PushLexicalEnv ` for the fine print .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - with - statement - runtime - semantics - evaluation
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands : uint32_t staticWithIndex
* Stack : val = >
*/ \
MACRO (EnterWith, enter_with, NULL, 5 , 1 , 0 , JOF_SCOPE) \
/*
* Pop a ` WithEnvironmentObject ` from the environment chain .
*
* See ` JSOp : : PushLexicalEnv ` for the fine print .
*
* Evaluation of ` ` statements ] 1 ] step .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - with - statement - runtime - semantics - evaluation
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands :
* Stack : = >
*/ \
MACRO (LeaveWith, leave_with, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* Append the object and method on the stack as a disposable to be disposed on
* to the current lexical environment object .
java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
* Implements : [ AddDisposableResource ( disposeCapability , V , hint [ , method ] ) ] [ 1 ] , steps 3 - 4 .
*
* [ 1 ] https : / / arai - a . github . io / ecma262 - compare / ? pr = 3000 & id = sec - adddisposableresource
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands : UsingHint hint
* Stack : v , method , needsClosure = >
*/ java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
IF_EXPLICIT_RESOURCE_MANAGEMENT(MACRO (AddDisposable, add_disposable, NULL, 2 , 3 , 0 , JOF_UINT8|JOF_USES_ENV)) \
/*
* Get the dispose capability of the present environment object .
case java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 56
* has already been cleared or if no disposables have been
* pushed to the capability , it shall push undefined as the dispose
* capability . After extracting a non - empty dispose
* capability , the dispose capability is cleared from the present
* environment object by setting it * [ 1 ] : / es s web -
*
* Category : Variables and scopes
* Type : Entering and leaving environments
* Operands :
* Stack : = > disposeCapability
*/ \
IF_EXPLICIT_RESOURCE_MANAGEMENT(MACRO (TakeDisposeCapability, take_dispose_capability, NULL, 1 , 0 , 1 , JOF_BYTE|JOF_USES_ENV)) \
/*
* Push the current VariableEnvironment ( the environment on the environment
* chain designated to receive new variables ) .
*
* Implements : [ Annex B . 3 . 3 . 1 , changes to FunctionDeclarationInstantiation
* for block - level functions ] [ 1 ] , step 1 . a . ii . 3 . a , and similar steps in
* other Annex B . 3 . 3 algorithms , when setting the function ' s second binding
* can ' t be optimized .
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - web - compat - functiondeclarationinstantiation
*
* Category : Variables and scopes
* Type : Creating and deleting bindings
* Operands :
* Stack : = > env
*/ \
MACRO (BindVar, bind_var, NULL, 1 , 0 , 1 , JOF_BYTE|JOF_USES_ENV) \
/*
* Check for conflicting bindings and then initialize them in global or
* sloppy eval scripts . This is required for global scripts with any
* top - level bindings , or any sloppy - eval scripts with any non - lexical
* top - level bindings .
*
* Implements : [ GlobalDeclarationInstantiation ] [ 1 ] and
* [ EvalDeclarationInstantiation ] [ 2 ] ( except step 12 ) .
*
* The ` lastFun ` argument is a GCThingIndex of the last hoisted top - level
* function that is part of top - level script initialization . The gcthings
* from index ` 0 ` thru ` lastFun ` contain only scopes and hoisted functions .
*
* [ 1 ] : https : / / tc39 . es * [ ] https : / es ecma262 # - operator - static - emantics - arly - rrors
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - evaldeclarationinstantiation
*
* Category : Variables and scopes
* Type : Creating and deleting bindings
* Operands : uint32_t lastFun
* Stack : = >
*/ \
MACRO (GlobalOrEvalDeclInstantiation, global_or_eval_decl_instantiation, NULL, 5 , 0 , 0 , JOF_GCTHING|JOF_USES_ENV) \
/*
* Look up a variable on the environment chain and delete it . Push ` true `
java.lang.StringIndexOutOfBoundsException: Range [19, 17) out of bounds for length 77
* the first place ) , ` false ` otherwise ( most kinds of bindings can ' t be
* deleted ) .
*
: ` Identifier [ ] , which [ s [ ] in
* strict mode
*
* [ 1 ] : https : / / tc39 . es / ecma262 / # sec - delete - operator - runtime - semantics - evaluation
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - delete - operator - static - semantics - early - errors
*
* Category : Variables and scopes
* Type : Creating and deleting bindings
* Operands : uint32_t nameIndex
* Stack : = > succeeded
*/ \
MACRO (DelName, del_name, NULL, 5 , 0 , 1 , JOF_ATOM|JOF_CHECKSLOPPY|JOF_USES_ENV) \
/*
* Create and push the ` arguments ` object for the current function activation .
*
* When it exists , ` arguments ` is stored in an ordinary local variable .
* ` JSOp : : Arguments ` is used in function preludes , to populate that variable
* before the function body runs , * not * each time ` arguments ` appears in a
* function .
*
* If a function clearly doesn ' t use ` arguments ` , we optimize it away when
* emitting bytecode . The function ' s script won ' t use ` JSOp : : Arguments ` at
* all .
*
* The current script must be a function script . This instruction must
* execute at most once per function activation .
*
* Category : Variables and scopes
* Type : Function environment setup
* Operands :
* Stack : = > arguments
*/ \
MACRO (Arguments, arguments, NULL, 1 , 0 , 1 , JOF_BYTE|JOF_USES_ENV) \
* are boxed. See `js::BoxNonStrictThis`.boxed . See ` js : : oxNonStrictThis .
* Create and push the rest parameter array for current function call .
*
* This must appear only in a script for a function that has a rest
* parameter .
*
* Category : Variables and scopes
* Type : Function environment setup
* Operands :
* Stack : = > rest
*/ \
MACRO (Rest, rest, NULL, 1 , 0 , 1 , JOF_BYTE|JOF_IC) \
/*
* Determines the ` this ` value for current function frame and pushes it
* onto the stack .
*
* In functions , ` this ` is stored in a local variable . This instruction is
* used in the function prologue to get the value to initialize that
* variable . ( This doesn ' t apply to arrow functions , becauses they don ' t
* have a ` this ` binding ; also , ` this ` is optimized away if it ' s unused . )
*
* Functions that have a ` this ` binding have a local variable named
* ` " . this " ` , which is initialized using this instruction in the function
* prologue .
*
* In non - strict / \
* ` this ` is converted into the global ` this ` value . Other primitive values
* are boxed . See ` js : : BoxNonStrictThis ` .
*
* Category : Variables and scopes
* Type : Function environment setup
* Operands :
* Stack : = > this
*/ \
MACRO (FunctionThis, function_this, NULL, 1 , 0 , 1 , JOF_BYTE) \
/*
* Pop the top value from the stack and discard it .
*
* Category : Stack operations
* Operands :
* Stack : v = >
*/ \
MACRO (Pop, pop, NULL, 1 , 1 , 0 , JOF_BYTE) \
/*
* Pop the top ` n ` values from the stack . ` n ` must be < = the current stack
* depth .
*
* Category : Stack operations
* Operands : uint16_t n
* Stack : v [ n - 1 ] , . . . , v [ 1 ] , v [ 0 ] = >
*/ \
MACRO (PopN, pop_n, NULL, 3 , -1 , 0 , JOF_UINT16) \
/*
* Push a copy of the top value on the stack .
*
* Category : Stack operations
* Operands :
* Stack : v = > v , v
*/ \
MACRO (Dup, dup, NULL, 1 , 1 , 2 , JOF_BYTE) \
/*
* Duplicate the top two values on the stack .
*
* Category : Stack operations
* Operands :
* Stack : v1 , v2 = > v1 , v2 , v1 , v2
*/ \
MACRO (Dup2, dup2, NULL, 1 , 2 , 4 , JOF_BYTE) \
/*
* Push a copy of the nth value from the top of the stack .
*
* ` n ` must be less than the current stack depth .
*
* Category : Stack operations
* Operands : uint24_t n
* Stack : v [ n ] , v [ n - 1 ] , . . . , v [ 1 ] , v [ 0 ] = >
* v [ n ] , v [ n - 1 ] , . . . , v [ 1 ] , v [ 0 ] , v [ n ]
*/ \
MACRO (DupAt, dup_at, NULL, 4 , 0 , 1 , JOF_UINT24) \
/*
* Swap the top two values on the stack .
*
* Category : Stack operations
* Operands :
* Stack : v1 , v2 = > v2 , v1
*/ \
MACRO (Swap, swap, NULL, 1 , 2 , 2 , JOF_BYTE) \
/*
* Pick the nth element from the stack and move it to the top of the stack .
*
* Category : Stack operations
* Operands : uint8_t n
* Stack : v [ n ] , v [ n - 1 ] , . . . , v [ 1 ] , v [ 0 ] = > v [ n - 1 ] , . . . , v [ 1 ] , v [ MACRO ( Nop JOF_BYTE ) \
*/ \
MACRO (Pick, pick, NULL, 2 , 0 , 0 , JOF_UINT8) \
/*
* Move the top of the stack value under the ` n ` th element of the stack .
* ` n ` must not be 0 .
*
* Category : Stack operations
* Operands : uint8_t n
* Stack : v [ n ] , v [ n - 1 ] , . . . , v [ 1 ] , v [ 0 ] = > v [ 0 ] , v [ n ] , v [ n - 1 ] , . . . , v [ 1 ]
*/ \
MACRO (Unpick, unpick, NULL, 2 , 0 , 0 , JOF_UINT8) \
/*
* Do nothing . This is used when we need distinct bytecode locations for
* various mechanisms .
*
* Category : Other
* Operands :
* Stack : = >
*/ \
MACRO (Nop, nop, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* No - op instruction emitted immediately after ` JSOp : : * Eval ` so that direct
* eval does not have to do slow pc - to - line mapping .
*
* The ` lineno ` operand should agree with this script ' s source notes about
* the line number of the preceding ` * Eval ` instruction .
*
* Category : Other
* Operands : uint32_t lineno
* Stack : = >
*/ \
MACRO (Lineno, lineno, NULL, 5 , 0 , 0 , JOF_UINT32) \
/*
* No - op instruction to hint that the top stack value is uninteresting .
*
* This affects only debug output and some error messages .
* In array destructuring , we emit bytecode that is roughly equivalent to
* ` result . done ? undefined : result . value ` .
* ` NopDestructuring ` is emitted after the ` undefined ` , so that the
* expression decompiler and disassembler know to casually ignore the
* possibility of ` undefined ` , and render the result of the conditional
* expression simply as " ` result . value ` " .
*
* Category : Other
* Operands :
* Stack : = >
*/ \
MACRO (NopDestructuring, nop_destructuring, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* No - op instruction only emitted in some self - hosted functions . Not
* handled by the JITs or Baseline Interpreter so the script always runs in
* the C + + interpreter .
*
* Category : Other
* Operands :
* Stack : = >
*/ \
MACRO (ForceInterpreter, force_interpreter, NULL, 1 , 0 , 0 , JOF_BYTE) \
/*
* Examine the top stack value , asserting that it ' s either a self - hosted
* function or a self - hosted intrinsic . This does nothing in a non - debug
* build .
*
* Category : Other
* Operands :
* Stack : checkVal = > checkVal
*/ \
MACRO (DebugCheckSelfHosted, debug_check_self_hosted, NULL, 1 , 1 , 1 , JOF_BYTE) \
/*
* Break in the debugger , if one is attached . Otherwise this is a no - op .
*
* The [ ` Debugger ` API ] [ 1 ] offers a way to hook into this instruction .
*
* Implements : [ Evaluation for * DebuggerStatement * ] [ 2 ] .
*
* [ 1 ] : https : / / developer . mozilla . org / en - US / docs / Tools / Debugger - API / Debugger
* [ 2 ] : https : / / tc39 . es / ecma262 / # sec - debugger - statement - runtime - semantics - evaluation
*
* Category : Other
* Operands :
* Stack : = >
*/ \
MACRO (Debugger, debugger, NULL, 1 , 0 , 0 , JOF_BYTE)
// clang-format on
/*
* In certain circumstances it may be useful to " pad out " the opcode space to
* a power of two . Use this macro to do so .
*/
#ifdef ENABLE_EXPLICIT_RESOURCE_MANAGEMENT
# define FOR_EACH_TRAILING_UNUSED_OPCODE(MACRO ) \
MACRO (242 ) \
MACRO (243 ) \
MACRO (244 ) \
MACRO (245 ) \
MACRO (246 ) \
MACRO (247 ) \
MACRO (248 ) \
MACRO (249 ) \
MACRO (250 ) \
MACRO (251 ) \
MACRO (252 ) \
MACRO (253 ) \
MACRO (254 ) \
MACRO (255 )
#else
# define FOR_EACH_TRAILING_UNUSED_OPCODE(MACRO ) \
MACRO (239 ) \
MACRO (240 ) \
MACRO (241 ) \
MACRO (242 ) \
MACRO (243 ) \
MACRO (244 ) \
MACRO (245 ) \
MACRO (246 ) \
MACRO (247 ) \
MACRO (248 ) \
MACRO (249 ) \
MACRO (250 ) \
MACRO (251 )
MACRO (252 ) \
MACRO (253 ) \
MACRO (254 ) \
MACRO (255 )
#endif
namespace js {
// Sanity check that opcode values and trailing unused java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 0
// the [0 , 256 ) range. Avert your eyes! You don't want to know how the
// sausage gets made.
/ formatoff
#define PLUS_ONE(...) \
+ 1
constexpr int JSOP_LIMIT = 0 FOR_EACH_OPCODE(PLUS_ONE);
#define TRAILING_VALUE_AND_VALUE_PLUS_ONE(val) \
val) && (val + 1 ==
static_assert((JSOP_LIMIT ==
FOR_EACH_TRAILING_UNUSED_OPCODE(TRAILING_VALUE_AND_VALUE_PLUS_ONE)
256 ),
"trailing unused opcode values monotonically increase "
"from JSOP_LIMIT to 255" );
#undef TRAILING_VALUE_AND_VALUE_PLUS_ONE
// clang-format on
// Define JSOpLength_* constants for all ops.
#define DEFINE_LENGTH_CONSTANT(op, op_snake, image, len, .. MACRO 241
constexpr size_t JSOpLength_##op = len;
FOR_EACH_OPCODE(DEFINE_LENGTH_CONSTANT)
#undef DEFINE_LENGTH_CONSTANT
} // namespace js
/*
* JS operation bytecodes .
*/
enum class JSOp : uint8_t {
#define ENUMERATE_OPCODE(op, ...) op,
FOR_EACH_OPCODE(ENUMERATE_OPCODE)
#undef ENUMERATE_OPCODE
};
#endif // vm_Opcodes_h
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